Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b33c84ddf74f96…

MALICIOUS

PDF

73.0 KB Created: 2021-02-12 04:00:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b7d6826b71cce41d605ea766782504b2 SHA-1: 928c64fa37f103477d66445db38931afaa45773e SHA-256: d5b33c84ddf74f9661ad8a2157abcb71e91d68d5978d3d6c06cd9f4ab3a34708
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics strongly indicate an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://druttle.ru/123?utm_term=honda+civic+ek+hatchback PDF link annotation
    • https://cdn.sqhk.co/zepipawetopi/2lijhdE/nusijotowip.pdfIn PDF document text
    • https://zixojubagever.weebly.com/uploads/1/3/4/6/134613499/3623513.pdfIn PDF document text
    • https://tozirodewekopax.weebly.com/uploads/1/3/1/4/131453541/degiwubukikifukumej.pdfIn PDF document text
    • http://voicebftyi.com/new_york_times_super_mega_crosswordva33v.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/bw5ihdm/nixagijex.pdfIn PDF document text
    • http://goodnaturak.space/countif_less_than_google_sheetsxrx9p.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/coifdgc/90962039915.pdfIn PDF document text
    • https://cdn.sqhk.co/toviranevu/6jbgjEd/93131438679.pdfIn PDF document text
    • http://ndfnasg.xyz/subwoofer_bass_test_music_mp3_download7io50.pdfIn PDF document text
    • https://cdn.sqhk.co/nipumusawobo/gcSimXJ/geruk.pdfIn PDF document text
    • http://f13x.xyz/85213968877uwhe7.pdfIn PDF document text
    • https://fejuratomejavud.weebly.com/uploads/1/3/0/7/130776174/rufamowuf-mobafok-vobavazikaz.pdfIn PDF document text
    • https://cdn.sqhk.co/rozopebak/fieHgjP/1789873273.pdfIn PDF document text
    • http://vrestoran.info/division_2_dlc_trophy_guide9lzsv.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/yjjHibV/auto_reply_email_sample.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zenudaxefuk.rf.gd/34473960639.pdfIn PDF document text
    • http://vugejepu.epizy.com/house_warming_ceremony_invitation_card_templates.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_off0000e18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 4944 bytes
SHA-256: 9a90086a3cb66e5dd644d83adbb083c3285ed1bfbab3306a46b96311e7e2ecf2
font_01_sfnt_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 10668 bytes
SHA-256: ea89e26318af5fd4ca3a62f0d012b1cb8c5b9d6ccc1696bb11a2fa634155140a

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