Malicious PDF — malware analysis report

Static analysis result for SHA-256 85732d7a2e3cab86…

MALICIOUS

PDF

81.8 KB Created: 2021-03-20 02:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d413216c3827592726da142337c64ec0 SHA-1: a61ecfb8195b8ae00af29dc533454aaaa7dc1c11 SHA-256: 85732d7a2e3cab862e9de52a4658d345857fe051f752547d877e2477d772ac35
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The presence of embedded URLs and the structure of the PDF point towards an attempt to redirect users to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • 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://fokemale.ru/award?keyword=despite+although+however+pdf
    • https://fejurisikem.weebly.com/uploads/1/3/0/7/130740008/jamilalukiwadotul.pdf
    • https://dudakodut.weebly.com/uploads/1/3/4/4/134497067/noxalokopowok-jebone-xenejox.pdf
    • http://lakujalinifibo.mypressonline.com/carbon_cycle_questions.pdf
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/7178352.pdf
    • https://cdn.sqhk.co/vavewiminiv/ggjihaC/55184148318.pdf
    • http://rivilidopu.medianewsonline.com/maytag_maxima_dryer_stopped_working.pdf
    • https://cdn.sqhk.co/gujipiror/P2ighiH/moksha_vs_nirvana.pdf
    • http://tozidak.mygamesonline.org/jetovamepikopotubuwul.pdf
    • http://botavubapisod.mywebcommunity.org/frecuencia_respiratoria_concepto.pdf
    • https://rerutafedebe.weebly.com/uploads/1/3/2/8/132815298/latojenorun.pdf
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/sifijamuxorad.pdf
    • http://gebevojika.mygamesonline.org/55283320178.pdf
    • http://kamikofonem.mygamesonline.org/catching_fire_movie_script.pdf
    • https://cdn.sqhk.co/jumifokujuje/S5NPmzq/4_in_a_row_play_free_online.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_ee59e5238e9c4f5aacfbd5927240b433.pdf?index=true
    • http://xojakawarola.rf.gd/kejif.pdf
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_7d349a0e2b0e4728a7b4f6f39ac31aa5.pdf?index=true
    • https://b24182fa-1fee-416c-9f57-41d8a36573e1.filesusr.com/ugd/1cc367_71b053f57c3846a389b3d0e733cb7d35.pdf?index=true
    • http://dojovosis.rf.gd/capacitor_bank_controller.pdf
    • http://vovakupalujum.onlinewebshop.net/pomebimuvifoxujajujef.pdf
    • http://lidudoxodirabi.rf.gd/how_much_are_batteries_for_invicta_watches.pdf
    • http://sufalejadi.rf.gd/xifebewaxan.pdf
    • http://vigavanoxe.onlinewebshop.net/sewimoxakewid.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_off0000fcdf.bin
e1fc73e4e85ddcb4fa46682f30c47ffd7169b184e8430bdbac25ac940de5b139		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 5452 bytes
font_01_sfnt_off00010f83.bin
72a61c3425278ceb5537282bb3bffe14c3ea417a70d2126a7f210a72684217a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F83 12800 bytes

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