Malicious PDF — malware analysis report

Static analysis result for SHA-256 8579e77eaa4e6e79…

MALICIOUS

PDF

84.0 KB Created: 2021-04-02 12:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d226a99cd9a70be9ac702cc597bfa677 SHA-1: 031b31d0fd5630038de53372e44f4fbe9973ccb1 SHA-256: 8579e77eaa4e6e79edc89747f26baed99f266b8daa529ed0e5371491ae1ca97e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to disposable hosting, suggesting an attempt to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains text related to 'digital photography lessons online free', likely a lure to disguise the malicious intent of linking to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • 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://druttle.ru/strik?utm_term=digital+photography+lessons+online+free PDF link annotation
    • https://cdn.sqhk.co/gobuwovuv/ChaeZij/nedek.pdfIn PDF document text
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/nikimabobidos.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/ii1tjdQ/lezadexozurilemodiposebux.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • http://svarka-aurora.online/79760022993uwrfi.pdfIn PDF document text
    • https://cdn.sqhk.co/lenufetimop/icb7icf/special_operations_forces_truths.pdfIn PDF document text
    • https://cdn.sqhk.co/sategexarom/fAchFgj/kpop_male_groups_with_9_members.pdfIn PDF document text
    • http://copyrights-notices-helps.com/john_deere_190c_belt_routing2gyak.pdfIn PDF document text
    • https://nituzizuzij.weebly.com/uploads/1/3/6/0/136091047/zagodirodekitilukas.pdfIn PDF document text
    • http://futup.ru/fazasain1ui.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401518/normal_5fc7fbfa7fce0.pdfIn PDF document text
    • https://xonajababivoxo.weebly.com/uploads/1/3/4/0/134040492/1837806.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/jdQsa34/beat_the_boss_2_pirate_ship_cheat.pdfIn PDF document text
    • https://cdn.sqhk.co/neguvobipa/gj74upk/bangla_full_movie_free_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372373/normal_5ffe7fd8ebd27.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/gih5hez/zombie_survival_video_game_light.pdfIn PDF document text
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/mopasigudefiroroketi.pdfIn PDF document text
    • https://lupawepenotude.weebly.com/uploads/1/3/1/6/131606523/jimuvilu-nasukabo.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/ghRQjfD/gurasofakirerulogos.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/gajakelegeza/xitux.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/80712325618.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/95069712521.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/filezilla_ftp_server_setup_guide.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_off0001067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 5264 bytes
SHA-256: 1d11dd0ccd35687109a650e63328cf3c8c2b13e989791903e40d2e794b9e031f
font_01_sfnt_off00011871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11871 11796 bytes
SHA-256: ccca4283c84a9280ac43796f95db0662613dd2787abbc79cd26825ccbd65383e