Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72471f1d7ff072d…

MALICIOUS

PDF

86.5 KB Created: 2021-03-26 13:29:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 75380de3a79b6e0d6fc861b066ddd9fd SHA-1: 17b30ad40cf9819c732170b9db0dfe84c1ba3341 SHA-256: f72471f1d7ff072d41717fda597a37873931ed84d93dd7933f16afb49b9e7abf
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://gimoguvi.ru/strik?utm_term=wireless+headphone+communication+systems PDF link annotation
    • https://cdn.sqhk.co/datolabevev/aidhj3A/find_my_old_friends_online.pdfIn PDF document text
    • http://reactivascotia2020.com/honeywell_lynx_touch_7000_installation_manualb8rkp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424630/normal_6006ae17db3c5.pdfIn PDF document text
    • http://baffer-shop.space/89295469697hc09a.pdfIn PDF document text
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/ed9c1772fb6.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/9213704.pdfIn PDF document text
    • https://pisolani.weebly.com/uploads/1/3/4/6/134668870/logopozedegudox.pdfIn PDF document text
    • https://cdn.sqhk.co/buganisazobu/Pig0Ehb/frag_pro_shooter_apk_1._7._0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530990/normal_6041e961c29df.pdfIn PDF document text
    • http://uscovidcharts.com/5694303561d9mkf.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/iawiilF/16922375144.pdfIn PDF document text
    • https://mizunilido.weebly.com/uploads/1/3/4/3/134352057/2ce01d.pdfIn PDF document text
    • http://filmera.ru/table_top_dirt_bike_jumps8cigj.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/jbQzhf6/cinderella_2015_soundtrack.pdfIn PDF document text
    • http://optamorem.com/which_refrigerator_is_best_lg_or_samsung_or_whirlpoolg68fs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461207/normal_5fd8f239548bf.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/rojalexipokadaz/how_do_i_share_a_past_memory_on_facebook.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/bajrangbali_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/20_sans_cis_critical_security_controls.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_off000114da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DA 5428 bytes
SHA-256: a57e7b8790f3ff63e5774ac5f774218c8299327047fafe34aaa048e52c0fba8d
font_01_sfnt_off00012734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 11272 bytes
SHA-256: 4794c65d1e6211cddf2f27a4434ce93445de5d04b415e85ca8492477b6f17a6e