Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bdfdb173a55de9…

MALICIOUS

PDF

70.4 KB Created: 2021-03-12 07:05:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3f7699067c8fb69540ce9e492b35571c SHA-1: 36e9a681c71371d35aec6beaa5e01a03e3d5c3a5 SHA-256: 36bdfdb173a55de988b49594fcc3dace9b06e0556d2bf86ba3fadf98616fbd3b
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 0.9996

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/strik?utm_term=vintage+vox+ac15+amp+for+sale PDF link annotation
    • http://chategratis.online/fasabebikipelujufkfloz.pdfIn PDF document text
    • http://ibkreactiva2020.com/70866552478d0duu.pdfIn PDF document text
    • http://winsbig.space/amiga_3000_kickstart_romf24bc.pdfIn PDF document text
    • http://zhigina.ru/how_to_use_a_wagner_pro_duty_power_painter911qw.pdfIn PDF document text
    • https://pedigujelod.weebly.com/uploads/1/3/4/0/134096449/1408822.pdfIn PDF document text
    • http://fullstacket.online/gibobosego052xi.pdfIn PDF document text
    • http://salearea.pro/kazosg4y68.pdfIn PDF document text
    • http://youla-24.cc/food_safety_manager_certification_indianaannf2.pdfIn PDF document text
    • http://wordsidepost.top/4511124188482jmq.pdfIn PDF document text
    • http://sodahq.club/singer_4411_vs_4423hd1fg.pdfIn PDF document text
    • https://xizuzumuk.weebly.com/uploads/1/3/2/6/132682261/bafugugoz_lifosi_popomulutugabus.pdfIn PDF document text
    • http://blankid.ru/kedilagutopivebenibegodal1j8g.pdfIn PDF document text
    • http://blog-millionaire.buzz/after_movie_book_series_order2uu8z.pdfIn PDF document text
    • http://texno3ua.com/82435619985zxm7o.pdfIn PDF document text
    • http://randname.ru/weight_lifting_routine_for_beginners_at_home09pn3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/rikabitakirisajotokug.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/is_goat_simulator_multiplayer.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/jolly_phonics_phase_2_worksheets.pdfIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_19f50f2695164e7faff17ee6b5190506.pdf?index=trueIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_1933cabf219c4db1955a0d0d5d10df73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/azhar_mimicry_video.pdfIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_25b77d2f5036491ab2d820371f3487ea.pdf?index=trueIn 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_off0000d5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DE 5604 bytes
SHA-256: ef5d120f936f2e37e1a6dd5cdb3ffe309606e9e6676a3c5c921c34db87cbc6c9
font_01_sfnt_off0000e8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 10336 bytes
SHA-256: 95ae0af399fbbc8dc66339f8664d3f607e026cb4bb0ca2046d2f3403c959f6f9

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