Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adb057c49120c99…

MALICIOUS

PDF

78.2 KB Created: 2021-05-26 14:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 55a333d9956a73bd2959d2ba4f5c7239 SHA-1: 45017abf342976ea3e158927113b7237f6cb72f9 SHA-256: 4adb057c49120c990bbb05ab53c772b7f404fa4e35c8d9da36f12bb299803fd6
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or harvest credentials. The heuristic 'SE_MFA_LURE' indicates the document may be attempting to harvest one-time codes or MFA approvals, consistent with credential phishing. 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-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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://fokemale.ru/strik?utm_term=how+to+fill+licence+form PDF link annotation
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/kumefefajetid_tamowovipe.pdfIn PDF document text
    • https://duditoza.weebly.com/uploads/1/3/2/3/132302736/3094287.pdfIn PDF document text
    • https://xoxazibazosilex.weebly.com/uploads/1/3/4/5/134590820/3252142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_606014e5e4ca2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449783/normal_5fd675b5bb1af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449395/normal_5fc985908fae8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427793/normal_5fd603099a483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493541/normal_60120bfb177bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367687/normal_6001f752a8e0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499999/normal_5fdda6ab8ea4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488103/normal_6002366f4eeca.pdfIn PDF document text
    • https://revijokatise.weebly.com/uploads/1/3/3/9/133999222/wuzoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473954/normal_602d453532b38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_604f7e5840566.pdfIn PDF document text
    • https://fizemovumevomuf.weebly.com/uploads/1/3/4/4/134491325/rubemutalipi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445864/normal_5ff566c3cdbd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486758/normal_6069ea40cb2ff.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/d9449637-fb04-44ba-b589-816b7d056627/how_to_install_scapy_in_kali_linux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/096d0e73-9cca-46f2-ad72-056a55c47b0c/42626738899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/846708e1-867f-4846-a2cc-d18779ca2228/92229931057.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 4692 bytes
SHA-256: 762db5c3621b9bf1edcff630d5c481b4dff8e8a1a685ca268cd7dcb9712101fd
font_01_sfnt_off000105d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D8 11156 bytes
SHA-256: ef7e0e073bc8c70fd1021adf469e3c96404213ff7cbf5e4ad5fbb713a8e77e2d