Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc6c9cc7b1946d1a…

MALICIOUS

PDF

117.6 KB Created: 2021-04-28 01:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9b8cc8fc22a013824f9548b5ff3cba5e SHA-1: b2b247dae85c168e4676ce3bf4e36688b54a6f3d SHA-256: cc6c9cc7b1946d1a4fc0a42689e17840d09f57c40c0b18ccbb0c5615744840cf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=arithmetic+and+geometric+sequences+word+problems+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5fd1a9073b417.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389599/normal_600189f90f935.pdfIn PDF document text
    • http://wodedutipif.medianewsonline.com/91540217305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464700/normal_60530bd2c463e.pdfIn PDF document text
    • http://gukivuzijisuva.getenjoyment.net/25987697497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392864/normal_60370e1d50316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375086/normal_6060fddec41f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366010/normal_6003b2d289811.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408336/normal_600364871007e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368238/normal_5fc645eec15a1.pdfIn 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/737f7444-2b92-4140-8549-1e18b05ada6a/nigavovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bb5501e-2c24-43c2-9457-f6903e0903da/zomaxipudazifopamizor.pdfIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_1e0d122973af4d25ae170fb9fbd8cfcd.pdf?index=trueIn PDF document text
    • http://regexepa.epizy.com/agenda_21_en_francais.pdfIn PDF document text
    • http://lejonawazemu.rf.gd/cha_cha_charey_video_song_1080p.pdfIn PDF document text
    • http://suzinukofam.epizy.com/civil_air_patrol_cadet_uniform_regulations.pdfIn PDF document text
    • http://rovafitazilom.epizy.com/cecelia_ahern_love_rosie.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_7407e35d08514c729ed1a6405365d57a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c6ab2bf-38db-4160-88c2-f238b88c53a4/marquis_de_sade_juliette_review.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_01855562b57245f58bb80978cb645d27.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000176eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176EB 6864 bytes
SHA-256: 7371351d0e45243c5811afdfa637b0491a167918f0d65c56d6ae8d2afaf2f9d8
font_01_sfnt_off00018838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18838 5900 bytes
SHA-256: 4f678a7e0938f6cfc22b6acb5898f4d039635f507a98c6fa05aea5be7ff027e6
font_02_sfnt_off00019c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C28 12916 bytes
SHA-256: 24c2406958d930e7de44e72f70e05885d129c3ae9e26c6bae59d05e675035039

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