Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8baac3c6225d6c…

MALICIOUS

PDF

69.6 KB Created: 2021-04-05 06:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b77a8920ab6128b87b4f13230218636 SHA-1: bb5aeb7339d51bf31fdab44f6d31cfaf98111be2 SHA-256: 8a8baac3c6225d6c819013cb2d8b4f5ad0e6c5aa2d424938210a12e821a6e86f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one suspicious URL pointing to a domain associated with malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document's primary purpose is to redirect users to malicious or SEO-manipulated content.

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://midufefew.ru/wix?keyword=cell+division+worksheet+%25231+microscope+images
    • https://cdn-cms.f-static.net/uploads/4416806/normal_604dc0718899d.pdf
    • https://cdn.sqhk.co/ravuviwidi/xZitUii/carrot_cake_recipe_for_dogs_and_humans.pdf
    • https://cdn.sqhk.co/fugapaloter/aIhfDgj/40445008669.pdf
    • https://cdn-cms.f-static.net/uploads/4415537/normal_600a233c7b8a8.pdf
    • https://cdn.sqhk.co/vimerokil/ggErjdH/51802451133.pdf
    • https://cdn.sqhk.co/noretokujazo/lLHz70x/66093064205.pdf
    • https://cdn.sqhk.co/pirujezexod/jbhfhim/wma_music_player_for_android_phones.pdf
    • https://cdn.sqhk.co/puwidebudojo/GoiiQQC/punofivuj.pdf
    • https://cdn.sqhk.co/bogivinon/hez8Tgg/76551552595.pdf
    • http://autocredit.moscow/botany_books_for_bsc_free3gffc.pdf
    • https://cdn.sqhk.co/jigavozef/b0gfheU/9561085385.pdf
    • https://cdn.sqhk.co/kidimezamos/DhhxNhm/wings_mod_for_minecraft_pe_1._16.pdf
    • https://static.s123-cdn-static.com/uploads/4459321/normal_5ff8536a4cbdd.pdf
    • https://cdn.sqhk.co/nokikifabaf/NTPggX4/farm_tractor_line_art.pdf
    • http://compte-cmbretagne.best/jewelry_appraisal_template_freewdkj9.pdf
    • https://cdn-cms.f-static.net/uploads/4418199/normal_603791752f735.pdf
    • http://digitaloffice24.ru/sacred_geometry_meaning_of_circleb1ynq.pdf
    • https://cdn.sqhk.co/sevimifogu/GXkhaib/voices_of_fire_choir_cast.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_3349a9e26c344a7eac7ece56a0b2b91b.pdf?index=true
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_2e1db9977cfe4d72af95d075ed7ca79f.pdf?index=true
    • https://4f870d4f-701c-4ec6-bbb3-7277acc5528a.filesusr.com/ugd/fdcb8d_1d2ce584e29f4c6881cb2004ced8ee8b.pdf?index=true
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_8798f1a0e9a540b3a35fe12573776967.pdf?index=true
    • 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_off0000d6bc.bin
619153a3dc1648461f544a7339de2894cfe11ab6704b4644beb037031bcef583		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 4824 bytes
font_01_sfnt_off0000e72e.bin
bcd60c516e4ca5502fb42bd539190f96e58cc2c2c02a863173eb3a1b7b564261		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 10024 bytes

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