Malicious PDF — malware analysis report

Static analysis result for SHA-256 656126cb7fc3388e…

MALICIOUS

PDF

73.0 KB Created: 2021-01-30 15:37:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fe43e89f09dfeb9ae3fb8f29e217ef43 SHA-1: d3903b47871a1b7fb4ee3fe71165789736d09502 SHA-256: 656126cb7fc3388e2a769d4bf8dc7bb1f68a04e88c11f02223faf4d91fa38a3c
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of external links and the 'Pdf.Phishing.Trojan' detection point towards malicious intent, likely to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/aws?utm_term=taxonomy+of+educational+objectives+1956+pdf PDF link annotation
    • https://cdn.sqhk.co/tinulafi/iRzhjZr/belkin_clear_screen_protector.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/jjjiGzC/zaxijimojoxula.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/ghgvGTv/the_wolf_chinese_drama_synopsis.pdfIn PDF document text
    • http://it50save.info/bass_clef_ledger_lines_worksheet_answer_keypjpjv.pdfIn PDF document text
    • https://cdn.sqhk.co/kosuxatune/icjghaP/jukezegevidixegowagimuka.pdfIn PDF document text
    • https://todumubisopid.weebly.com/uploads/1/3/5/3/135312552/055964397e443a5.pdfIn PDF document text
    • http://mscredit.info/among_us_stickers_pro_settings3s4pa.pdfIn PDF document text
    • http://sportplays.ru/18963211909ohyi7.pdfIn PDF document text
    • https://sizomejuxitiz.weebly.com/uploads/1/3/4/7/134748976/2991042.pdfIn PDF document text
    • https://cdn.sqhk.co/kiviziko/ihhBUgj/my_singing_monsters_breeding_guide_dawn_of_fire.pdfIn PDF document text
    • https://rinugofanux.weebly.com/uploads/1/3/1/4/131437530/rorikumifo.pdfIn PDF document text
    • https://bosudire.weebly.com/uploads/1/3/4/4/134456289/dibavabipex_tesej.pdfIn PDF document text
    • http://tixshopclub.fun/hernandes_dias_lopes_download0sr77.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/fifWpij/10238224907.pdfIn PDF document text
    • http://medupaj.iblogger.org/divinity_original_sin_2_final_fight_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/mavozopofug/rRO5Pji/gofibo.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/zarusegibitumet/lerekateb.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/vfs_global_portugal_visa_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/colmar_france_tourist_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_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 6084 bytes
SHA-256: 61977fa7b231eb1bfb40d15284a8574e2fd515cb4b448874546f6b9e50a15389
font_01_sfnt_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 11956 bytes
SHA-256: c2d3049f8672f05bf0ffe914751d1a48f5d91caecc97bf48ef45faac560ac4dd

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