Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a72fd964eae3ef2…

MALICIOUS

PDF

75.6 KB Created: 2021-03-20 20:46:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 894028ad757873d1ce43e0b0311b3309 SHA-1: ef7c2958b264ffe46752fa13d15d9789cb33536d SHA-256: 5a72fd964eae3ef211302312352cc2df3ed7bc6f7aa9bcf193ab7ecb16314d0e
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 0.9997

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://mezovuduw.ru/strik?utm_term=the+art+of+color+johannes+itten+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/momujolo/gYCtqig/best_captions_for_pics_on_mountain.pdfIn PDF document text
    • http://wgathering.org/nesawoxafonedemamegavo4qpyz.pdfIn PDF document text
    • https://cdn.sqhk.co/zamepeja/jjicOij/bufamu.pdfIn PDF document text
    • http://medyayazilimtr.com/assamese_comedy_video_freejivkn.pdfIn PDF document text
    • http://gradstroy.su/vewekuwobojasefopixiha2h.pdfIn PDF document text
    • http://tryporte.xyz/xobatubipuraluzowuggh3s.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/jbsheLG/bsc_2nd_year_botany_syllabus.pdfIn PDF document text
    • http://difavusimope.iblogger.org/canadian_girl_guide_cookies_vegan.pdfIn PDF document text
    • http://eagleaff.com/cost_of_living_comparison_worldwide1jmfq.pdfIn PDF document text
    • http://fafasun.iblogger.org/77575752440.pdfIn PDF document text
    • http://nunesop.scienceontheweb.net/harman_pellet_stove_insert_distribution_blower_not_working.pdfIn PDF document text
    • http://vutunema.mypressonline.com/how_to_remind_yourself_of_your_goals.pdfIn PDF document text
    • http://golden-bridge.pro/koxavogedawaxkgkn.pdfIn PDF document text
    • http://onlinekartiadesi.com/zagisonabenogetvd.pdfIn PDF document text
    • http://kismykeitio.best/requirements_for_church_wedding_in_the_philippines_2018ak0pj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://malinaliwul.epizy.com/the_dalaran_heist_mage_guide.pdfIn PDF document text
    • http://tafujeloraxofo.epizy.com/7862974777.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/dch_file_t_ting_nht_sang_ting_vit.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/how_many_commands_are_there_in_kali_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/zekurupijubozujomipolobel.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_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 5360 bytes
SHA-256: b844124c2f527985f8f5064eef848cde23ae6717963e63b38650ff2526a65e9d
font_01_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 11328 bytes
SHA-256: 92994f54cb4e280769c0496259b0a9642a6bc3cd61781d3fddc06de58568edd0

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