Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6f17d24ea4a6c2…

MALICIOUS

PDF

80.8 KB Created: 2021-04-14 13:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23441d89e0336b349d27f120e7eb1f2d SHA-1: 25ccf095c50a687a3535cf077cea1ad1b9216a0b SHA-256: 8a6f17d24ea4a6c2798ce535d50d01305625909e6b038c812feecda3b2853d79
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=what+is+stock+explain+with+example
    • https://cdn.sqhk.co/bopibege/CiaPU4O/mathemagic_assessment_test_4_answers.pdf
    • http://my-favshopf.online/5962432935r87ll.pdf
    • https://cdn.sqhk.co/kosojilufut/hlXPNhy/vizuloravopomuvifovirewam.pdf
    • https://cdn.sqhk.co/vasibejovej/cdgjk8h/55786865132.pdf
    • http://mybestchan.online/nutrition_et_organisation_des_plantes_5me_evaluationr5vlo.pdf
    • http://sberbank.link/fl_studio_mobile_download_link_google_drive4ne75.pdf
    • http://avtovishki-msk.ru/what_does_a_guardian_ad_litem_do_in_north_carolinar9p8u.pdf
    • http://creampiepow.club/what_is_a_good_hyperbolen8pqm.pdf
    • https://cdn.sqhk.co/norowitidot/jh2haHa/gosegosubiraf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_969b54de2dc040e6943786601d18297b.pdf?index=true
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_50154b202d104a348b64c7da42177365.pdf?index=true
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_0a91a7b5e719475e960e92ad8f067985.pdf?index=true
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_5db80b3fc014469493ecac88794afb9a.pdf?index=true
    • https://s3.amazonaws.com/zebarufuridorur/58659229908.pdf
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_95d6d4f700fa4205ace531f61b1d14ca.pdf?index=true
    • https://s3.amazonaws.com/sajezife/12608366237.pdf
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_2409370b8af9404a961d5fb0bf2a244d.pdf?index=true
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_28a462b8e1084e04b63ce183b5c80990.pdf?index=true
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_39f2587fbec94bbd9f1837530b26fc05.pdf?index=true
    • https://s3.amazonaws.com/xupizewuxere/nefebujavuwujorowu.pdf
    • https://s3.amazonaws.com/safenalavojuwu/what_is_another_word_for_sword_fighting.pdf
    • https://s3.amazonaws.com/gavapozalilup/48262327868.pdf
    • https://s3.amazonaws.com/xowasosuf/housekeeping_supervisor_job_interview_questions_and_answers.pdf
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_7661a155ff26456c9d7520a5e3bb5da3.pdf?index=true
    • https://s3.amazonaws.com/ruzaganog/busotidira.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000face.bin
6e082bd3b5bcb87557657b7e4b73279aecf035e033780d319fefa63fbb3d7757		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 5316 bytes
font_01_sfnt_off00010cd6.bin
2d27475d8dc64294a0c85553d0923cdf10edadfdc2923c5d3c302f8003a2715c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 11712 bytes

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