Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad52a003796cd843…

MALICIOUS

PDF

71.3 KB Created: 2021-02-18 03:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9d3040d418822cf68db3e347a32fa8e9 SHA-1: b1c7cf8f3c8920c3b2516a2482cb740eccde57fa SHA-256: ad52a003796cd8432b63549187923624ce4c2a8cef53885db2af935f94dd631a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to search queries, likely to trick users into clicking through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/aws?utm_term=how+much+does+a+nutritionist+cost+in+ontario PDF link annotation
    • https://cdn.sqhk.co/kegufamop/ibZhhhb/luke_bryan_love_songs_youtube.pdfIn PDF document text
    • http://daating19.site/tujudafevoluvotezevaffdq8f.pdfIn PDF document text
    • http://alphabitx.com/the_abcs_of_violin_for_the_absolute5645m.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/UlWiiie/diaphoresis_postpartum_causes.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/Arehfgj/29731840531.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469135/normal_5feb8824d852d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481513/normal_602ba47301e3e.pdfIn PDF document text
    • https://jidobatixinel.weebly.com/uploads/1/3/4/7/134726111/2417950.pdfIn PDF document text
    • http://rokemefofiz.iblogger.org/76810278635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501775/normal_601275166116b.pdfIn PDF document text
    • http://about-fb-support.com/wetelil22t9.pdfIn PDF document text
    • http://rakuropa.iblogger.org/ip_igmp_snooping_proxy-_reporting.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479223/normal_601eda7c2e45a.pdfIn PDF document text
    • http://itawegan.space/jesus_storybook_bible_videos_easter2smdz.pdfIn PDF document text
    • http://twitter-center.com/290825296221ik2h.pdfIn PDF document text
    • http://linudanozuno.iblogger.org/77011015089.pdfIn PDF document text
    • http://ita-talia.fun/bivojijavumajitawurenegaj99syd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424011/normal_5ff653d72ccd1.pdfIn PDF document text
    • http://100p-f.ru/exercice_vitesse_6eme_physiquehjbs0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limizepafut.epizy.com/nejiduranevik.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_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 5200 bytes
SHA-256: 95af765f6e667d2c776abce8edfc29bc7dd256ed9da8fff275e5177704def76c
font_01_sfnt_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 11404 bytes
SHA-256: 9138b126839d1ec9d6c6585e440231ac6a9d203db066e870e05405103a0e63f7

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