Malicious PDF — malware analysis report

Static analysis result for SHA-256 2847d1fb6089ae21…

MALICIOUS

PDF

87.7 KB Created: 2021-03-12 19:00:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42bf5bd1a06ed528f288c5265619bec2 SHA-1: afd29afd8e80562eb204ba7ca19a2cdaa880aaa3 SHA-256: 2847d1fb6089ae211243901be024093272e88833c5950bb329f3e0cdd7ff4b9a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO abuse tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=easy+diy+little+red+riding+hood+costume
    • https://cdn.sqhk.co/zopinulepa/aLF3Dha/puvumo.pdf
    • https://cdn.sqhk.co/folukize/jdiceha/clock_change_fall_2020_illinois.pdf
    • https://cdn.sqhk.co/zojixemem/jhHLeih/pewinawoderex.pdf
    • https://retezuve.weebly.com/uploads/1/3/2/7/132741149/joluf.pdf
    • https://cdn.sqhk.co/fogibadeku/jbjjZxb/consolidated_theatres_mililani_logan.pdf
    • https://cdn.sqhk.co/fomeluxilim/jjbdibk/livalepesuwozolobafubak.pdf
    • http://kinemulawaw.sportsontheweb.net/wosokugoxitamanoko.pdf
    • https://cdn.sqhk.co/nipigagavadu/jjdW28T/46581463809.pdf
    • https://cdn.sqhk.co/xubulozirod/jfGMnUS/cosmic_kick_kung_fu.pdf
    • https://cdn.sqhk.co/guledijuxi/BOjageq/27540977252.pdf
    • https://putuxukive.weebly.com/uploads/1/3/1/3/131379249/154abcd016.pdf
    • http://gravkamen.ru/buzz_lightyear_space_ranger_spin_disney_world_tipsoijby.pdf
    • https://guduzuzej.weebly.com/uploads/1/3/1/6/131606672/mopozepomosej.pdf
    • https://buderenedisam.weebly.com/uploads/1/3/5/3/135302361/bisix.pdf
    • https://cdn.sqhk.co/ninujamezol/hfgcIie/riverside_drive_in_leechburg.pdf
    • http://testersairf.xyz/70308650892pqmk6.pdf
    • http://movawizaxaxato.mywebcommunity.org/david_klein_organic_chemistry_3rd_edition_answer_key.pdf
    • https://cdn.sqhk.co/zuzudumijamo/jiujdgi/ketilolivuresugukabevi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/87415054-b3a2-45f9-95ea-5714b1d8d868/without_regret_synonym.pdf
    • https://uploads.strikinglycdn.com/files/2f6cf0cc-f44b-4330-80f0-8ed107ed27ee/speed_queen_tc5000wn_parts_manual.pdf
    • https://uploads.strikinglycdn.com/files/b1195cad-f47f-4eb0-8704-4a7b594749e8/bosch_ecosense_dishwasher_reset.pdf
    • https://uploads.strikinglycdn.com/files/f4d5b921-bf5a-415b-bc41-47e56e48866b/14979369246.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_off00011b47.bin
418cc7ad364c76dcc3fce578c123c39625b3f04f740865af26e92b98432c5141		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B47 5412 bytes
font_01_sfnt_off00012d92.bin
1c9cf99d86d9665c2ca90264c05f46598ce4694df6cbba3406c570f8ccf7d610		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D92 10424 bytes

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