Malicious PDF — malware analysis report

Static analysis result for SHA-256 98359fa875e30e48…

MALICIOUS

PDF

80.8 KB Created: 2021-03-24 06:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 01ab94f7ea133fe1a93cf13698dd9799 SHA-1: e03883b55a138b120680f7ef05f75b984648b7ba SHA-256: 98359fa875e30e4839ed9778e4d6e52e0f03280d83bcf157e4381aa921bf6e7c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/wix?keyword=rational+functions+and+their+graphs+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479921/normal_6024c8903bb29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391319/normal_601fb3dde8d04.pdfIn PDF document text
    • http://sorifaj.22web.org/takilejavumev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_5fe88151aefc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417329/normal_604fde9f8ca56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_60413d66b8d86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375886/normal_600316b8833cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445754/normal_603f346aecd92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_6028f2e69748c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_60451597af78c.pdfIn PDF document text
    • http://lunotikipadul.66ghz.com/u._s._air_force_dress_uniform.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_6034cf1dacfa4.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0ab7eb2-c7b5-435f-86cc-760298e3d636/how_long_can_you_drive_with_a_flashing_engine_light.pdfIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_aeab43aa239e4719a7900dff98f929af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5116b17-49a5-4fed-b99a-5080b23c8bac/dejakitotil.pdfIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_ebdfa618152d41f499c9d890331c37f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df4af1e9-4838-4821-8918-0126309547e6/mevisosefowawosomit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dc69294-62b7-4c2b-aaa9-f592f52bbea3/south_carolina_drivers_license_restrictions_codes.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_5d0153ba9eea48da8477a94175d92cbb.pdf?index=trueIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_03bc77d1a3c64d01a840aa4fb832df4a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/829cb5a2-bbf7-4d6e-9709-f2a79156a2f9/self_leadership_and_the_one_minute_manager_free.pdfIn PDF document text
    • https://0a38098d-26c8-4844-ab0b-2dfc398d7f8d.filesusr.com/ugd/fffd55_7c77cf69902944b285a94066b84068f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a1296a4-6775-4597-ad3a-cd448fec7e23/boards_and_beyond_download_reddit.pdfIn PDF document text
    • http://jilutuve.rf.gd/android_studio_sharedpreferences_save_arraylist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2bf4bba-fa8f-42d9-9f12-328ee5a89de0/dish_vip722k_remote_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/333b0e27-1dd2-44a1-bac6-f934b1ab662a/82758609259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04fc450a-470f-4ab3-975a-43e3a8ebb547/5542674742.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 6960 bytes
SHA-256: f8f99e7674e6feb75160f61083fb63acdc532d1033b40f6eb8f9a7e125d067a2
font_01_sfnt_off0000f1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 3084 bytes
SHA-256: b43a608e2eae90e9401f68a5f60238382ac988a9e0957d5873480e702983c162
font_02_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 5580 bytes
SHA-256: 7cafa74038eea9ded8b5256174645e35c2ad0015012d514b68b0838aa57aa4f2
font_03_sfnt_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 10124 bytes
SHA-256: e279d90bb848ce9cdc7b6fd9766ad1f481457a0c2f90e7f78d1901637925870f