Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b2ae3dcda1c075…

MALICIOUS

PDF

81.7 KB Created: 2021-04-06 04:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 617c2a55254ce19282a64c7d51eb9f8f SHA-1: 1529de5c279237e5f9865b6ca8dca87155e5d0d6 SHA-256: 60b2ae3dcda1c0759934a29eeb9608aade407bf64782fbb7b13cd66cc57b834e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, forming a link farm, and one of the embedded URLs is `https://jacksth.ru/wix?keyword=chapter+1+what+is+economics+crossword+answers`. This suggests the document is designed to appear as a search result to trick users into visiting malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://jacksth.ru/wix?keyword=chapter+1+what+is+economics+crossword+answers
    • https://dusivasawomila.weebly.com/uploads/1/3/4/6/134660852/2462667.pdf
    • https://cdn.sqhk.co/mugolino/bPfigMR/26152962426.pdf
    • https://fijitedutim.weebly.com/uploads/1/3/1/1/131164269/kitedowujaleru.pdf
    • https://cdn.sqhk.co/ruxodinumoro/ia1Eih1/amaze_file_manager_app.pdf
    • http://instapodarok.site/why_is_my_foodsaver_stickymsjo7.pdf
    • https://vizosajigu.weebly.com/uploads/1/3/1/3/131381839/fatitovadinu.pdf
    • https://cdn.sqhk.co/jivumigen/VwjfJXZ/website_design_cost_in_bangalore.pdf
    • https://pilinasovoda.weebly.com/uploads/1/3/4/1/134132167/kubujigaxovogow_tinugowak_lamadadunori.pdf
    • https://cdn.sqhk.co/wabajevebe/i8iiyjc/gabuvovonawibewisiwowoja.pdf
    • https://burubigek.weebly.com/uploads/1/3/4/8/134884838/697302.pdf
    • https://cdn.sqhk.co/fedelubu/sjbidgc/toxifiw.pdf
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/6173824.pdf
    • https://bizudabug.weebly.com/uploads/1/3/4/7/134722823/gokij-mopafadukeb-tivota.pdf
    • http://kupiokno.su/fakoreduxoziniseq508.pdf
    • http://fineagencyy.com/pokuwolqcd4r.pdf
    • http://vittorguxx.site/all_sat_practice_testshg9yx.pdf
    • https://kekoluborefox.weebly.com/uploads/1/3/5/3/135327445/7401503.pdf
    • https://cdn.sqhk.co/jaxaletadi/vZicMbJ/bolovi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5da4e559-3ee7-457d-9ee0-a0843856c167/craftsman_battery_charger_lights.pdf
    • https://uploads.strikinglycdn.com/files/cf426f86-8304-4a67-be41-2e5bd854aaee/71788987662.pdf
    • https://uploads.strikinglycdn.com/files/cb9c45d4-3c87-46ea-bef6-3e31c30d6151/washington_wizards_best_players_2019.pdf
    • https://uploads.strikinglycdn.com/files/139e09d1-0786-4046-b3ee-3f781b3e3e5d/engineering_dynamics_inc.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_off000101e7.bin
4a120406e3bfce1895384eb184f3f5f35312b1a64c96a6e8d4f9ba814a3caf74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 5328 bytes
font_01_sfnt_off000113ed.bin
ce99d442a46ea452424ba2da36402a4c81ee8f235f2f8fefc607a07b7f10ace4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 10860 bytes

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