Malicious PDF — malware analysis report

Static analysis result for SHA-256 6101c6144a0711d1…

MALICIOUS

PDF

74.0 KB Created: 2021-02-15 16:19:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 54b2991e9ac54f409db1b28b4f6510a8 SHA-1: 8b1085541e8ec42a0c36fce6288f70c5892d8d1b SHA-256: 6101c6144a0711d1a67b034868edd5ec3a065ab98d12670d7c6f88c2eb8bd8ac
276 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is identified as a credential phishing lure impersonating Facebook. It contains numerous external links, many of which are part of a link farm, and directs users to a malicious redirector URL. The document's purpose is to trick users into revealing their account recovery secrets or private keys, likely leading to account compromise. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/9846993.pdf.
  • 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://leonvi.ru/strik?utm_term=what+is+facebook.com%252Frecover PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404520/normal_602a4bfb935cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5fe8c7736b248.pdfIn PDF document text
    • https://cdn.sqhk.co/nabixisaf/jigghey/happy_tower_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499300/normal_5fd95936b326d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375361/normal_5ffc470ebdd3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366366/normal_5ff91613acb14.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/9846993.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/6411892.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/jfigjjk/muviz_navbar_music_visualizer_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/gizlgha/pc_games_download_free_windows_10.pdfIn PDF document text
    • https://bumekutuwa.weebly.com/uploads/1/3/1/4/131452846/4112866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5fd94a7f405e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456372/normal_5fd98a13e030c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381962/normal_5fe8e06001869.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/KhdhgQW/dasukinakas.pdfIn PDF document text
    • https://fabupegux.weebly.com/uploads/1/3/4/6/134689396/navuzovolim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 5436 bytes
SHA-256: ef48c18c0727d1ed7258bb95a15263a1b7213e0455fe3b8cce1406d042d0ffe4
font_01_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 11436 bytes
SHA-256: 37f8bc2408f174ce55517dd06ac965f4af55baaa3b73fda525b60c4713d08c8d

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