Malicious PDF — malware analysis report

Static analysis result for SHA-256 73937e6924d90259…

MALICIOUS

PDF

89.7 KB Created: 2021-04-08 01:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d26f81fff21a4a3c1c5b7c6d6b55ede5 SHA-1: 5f0daf965e53a346ee3cb3b262047463e7d99596 SHA-256: 73937e6924d9025987f172120ce5aada64d9c8f38d71ac26b947fc4d5a0a5bdb
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jottigo.ru/123?utm_term=financial+accounting+practice+questions+and+answers PDF link annotation
    • http://xuzotudaraderuf.mypressonline.com/water_cycle_quiz_worksheet.pdfIn PDF document text
    • http://kwini-fini.online/badakupatovumabebisutrvyyu.pdfIn PDF document text
    • https://padipemoton.weebly.com/uploads/1/3/0/7/130739419/3a5eeae73053b.pdfIn PDF document text
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/goxixazajin.pdfIn PDF document text
    • https://newosupileseru.weebly.com/uploads/1/3/2/3/132303396/e870044.pdfIn PDF document text
    • http://indonesia2health.online/dell_1320c_driver_download_windows_10q9hub.pdfIn PDF document text
    • https://ruvawuwejijexut.weebly.com/uploads/1/3/0/8/130814193/831070.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/jj8yjay/toy_piano_virtual_instrument.pdfIn PDF document text
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/wurab-kejam.pdfIn PDF document text
    • http://itagreen.fun/wimegamuqes96.pdfIn PDF document text
    • http://numulul.mygamesonline.org/lipinenaviradif.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/fF72jjj/bubble_shooter_mania_2019.pdfIn PDF document text
    • http://gomijexa.mywebcommunity.org/worugizipamokovejex.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/seguro_social_para_empregadas_domestvtops.pdfIn PDF document text
    • http://gatorama.site/nlp_introduction_python30sqc.pdfIn PDF document text
    • http://segwaywheelchair.ru/crosley_record_player_needle_slidinggq458.pdfIn PDF document text
    • http://podarokinsta.online/30390512793ferf1.pdfIn PDF document text
    • http://newberginvestmentproperty.com/alphabet_letters_worksheets_free9m0yy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xobebol.onlinewebshop.net/zarosarozunivawavujolenul.pdfIn PDF document text
    • http://fabonejane.onlinewebshop.net/kugopumosoxedeveroro.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_off00011f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6A 5416 bytes
SHA-256: 6197f9e05d3d8ea0ba491c676a8816f8baa69f899945bde730f29f27b6cfc812
font_01_sfnt_off000131f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F0 11084 bytes
SHA-256: 4c127cd5e67781b7c69d5eb54d6b6799a1c8ea4dde85f7aed2b87f73e65a85b1

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