Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a9f2e4d8c0c40e…

MALICIOUS

PDF

90.9 KB Created: 2021-06-05 18:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 57217652b9f598011bb0f74168e0f55f SHA-1: b25c6c8ce8ba12a1c7ac26326790db80ebe82971 SHA-256: 07a9f2e4d8c0c40e77a46f7e08a0e1b2ca604fc2af57463f6ab6a5ba5ea5b9d3
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 0.9978

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://resalured.ru/123?utm_term=iay.+nic.+in+reports+2019+new+list PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474448/normal_5fc726af57cac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411220/normal_604cf9137da61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409421/normal_604a8aa1e1697.pdfIn PDF document text
    • https://mejonozawus.weebly.com/uploads/1/3/4/0/134016798/tirujibeza.pdfIn PDF document text
    • https://dowoxadi.weebly.com/uploads/1/3/1/3/131380004/xigaperidu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421787/normal_5ff4c7bb00879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_5fd6cd83744e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477910/normal_5fff6176ec895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381766/normal_602bfb7cbe500.pdfIn PDF document text
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/pavilu-konaxali-nowewasovuja.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4468286/normal_60b2b98cef151.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/91015959-b860-470e-9d6d-bea237d7470b/vuvajilapivejer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5818a6a8-86a1-4a44-959b-3b9e91bec844/jarulomukujojudalurufukog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73bea92a-a134-4a39-af5c-61b69437b3d7/33528969806.pdfIn PDF document text
    • http://gudikijuruf.pbworks.com/w/file/fetch/144577413/enemies_with_benefits_movie_streaming.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144425484/mymathlab_college_algebra_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/282d4020-c523-4854-91b8-c853e60dd403/xerox_workcentre_7545_fuser_system_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd93124-44e8-4dde-8760-0a886dd704c8/zezibawaladosoluperi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9187a8dc-a5c4-4eb5-8485-9a9522dc1fe5/86264451793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94734bfa-94ae-46f5-90bb-158c920728ac/4566854517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2e31bd-053e-43a0-83aa-94e6240ca798/47251351533.pdfIn PDF document text
    • http://mupalunava.pbworks.com/w/file/fetch/144569232/25126147347.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144423600/moxanapapukiseporewekere.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/crash_bandicoot_ppsspp_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ac3c724-b85f-4526-b92a-841c5f8a4bc4/zodosov.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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 5572 bytes
SHA-256: e2be50383f45bcc2fbd70772a0f76642fa785cd07ff67caaf09756ad850bd200
font_01_sfnt_off000104dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 11072 bytes
SHA-256: 0cdc524351da27d6b1f09fce742be297bbb0527619109c6ef65d616b647d80e7
font_02_sfnt_off00012a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A80 16196 bytes
SHA-256: a715a394ba7442d6ee2f8e171f1dd1083c43ceeaa12705bc30c13df8786bd7ac
font_03_sfnt_off0001400e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400E 7984 bytes
SHA-256: ddacc5ad46a03dfe240c24afb7a3d2add1ff4791b3eef912f76243341bd4b452