Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8839fb9eb6a31c5…

MALICIOUS

PDF

99.7 KB Created: 2021-01-21 03:22:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 32241fee42ba3213f5ce32a1e20af44d SHA-1: aab32bd9f08a7481c17be452f63329907dda3c3a SHA-256: b8839fb9eb6a31c597f4916d57d7c89910ff9811f2f8f802397cbf61a628b3ad
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for brand-impersonation credential phishing. The document leverages a link farm on disposable hosting, directing users to a redirector URL associated with phishing. The ML classifier output of 0.999737 strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://xamukujivova.weebly.com/uploads/1/3/1/3/131384573/dizovakega_bipazijadeni_dovosudupolod.pdf.
  • 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://traffset.ru/aws?utm_term=qualitative+characteristics+of+accounting+information+with+examples PDF link annotation
    • https://site-1173944.mozfiles.com/files/1173944/51632828689.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/UidzghI/nimamowotufikotukikagisi.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/Xge6pid/15361919300.pdfIn PDF document text
    • https://site-1177689.mozfiles.com/files/1177689/sexisixizivuparigo.pdfIn PDF document text
    • https://site-1204510.mozfiles.com/files/1204510/65622175443.pdfIn PDF document text
    • https://site-1176351.mozfiles.com/files/1176351/rowebakemesopemuzav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372673/normal_5f88b51abade5.pdfIn PDF document text
    • https://site-1174809.mozfiles.com/files/1174809/motown_greatest_hits.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450038/normal_5fbcbb2949e9c.pdfIn PDF document text
    • https://site-1172263.mozfiles.com/files/1172263/tikuvirevamuj.pdfIn PDF document text
    • https://xamukujivova.weebly.com/uploads/1/3/1/3/131384573/dizovakega_bipazijadeni_dovosudupolod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443337/normal_5fd68573001a4.pdfIn PDF document text
    • https://site-1172726.mozfiles.com/files/1172726/45541199574.pdfIn PDF document text
    • https://gijowazav.weebly.com/uploads/1/3/4/0/134097260/kalin.pdfIn PDF document text
    • https://site-1228403.mozfiles.com/files/1228403/croup_guidelines_nz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fezipowivi.rf.gd/vobagiwot.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_off000146d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D4 5708 bytes
SHA-256: af7f63e04cd41b09def42b3a1ba2f9ce928f6372552946e326831e28fac6b14b
font_01_sfnt_off00015a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A37 11352 bytes
SHA-256: f2e50eb7daa6e3b0d2e754f7c4b390b19395a39300b9d3ee56ac3bd0d9ac4d63

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