Malicious PDF — malware analysis report

Static analysis result for SHA-256 99519d77b2601195…

MALICIOUS

PDF

77.1 KB Created: 2021-03-02 08:13:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: caa782bbbecdc4c314dc3d828e0b3af4 SHA-1: acf3d29d3feb5b625653a4dd840f92e1e17c8426 SHA-256: 99519d77b2601195fceee6e26cdcee695ca5d182379ee6f80c59b25d7b14447d
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, with heuristics flagging it as a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=albert+einstein+erfindung+atombombe PDF link annotation
    • http://optamorem.com/garmin_52_with_traffic_reviewsdypx3.pdfIn PDF document text
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/bc074ec6c.pdfIn PDF document text
    • https://jumifusat.weebly.com/uploads/1/3/4/6/134629025/temidexobub_genemugemibamar_vusetuxowomobak.pdfIn PDF document text
    • https://cdn.sqhk.co/bosareke/BgiEgeO/fbi_cyber_security_newsletter.pdfIn PDF document text
    • https://cdn.sqhk.co/juvokapo/bhjvgcR/barcode_scanner_app_free_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/hdmheic/57297372215.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/udfgjbj/daditukolowujif.pdfIn PDF document text
    • https://cdn.sqhk.co/nimenodeloxa/ghgciR2/82589863617.pdfIn PDF document text
    • http://dezlice.ru/rome_total_war_barbarian_invasion_emergent_factions_mods9v2l.pdfIn PDF document text
    • https://cdn.sqhk.co/solijisivono/iip2fif/47389231420.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/gVgdih4/fitbit_sense_black_friday_deals.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/hjQ1hif/gubolafake.pdfIn PDF document text
    • https://pigixona.weebly.com/uploads/1/3/5/9/135986477/kipekixikafikupali.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jipipazed.epizy.com/rosemount_3051sfc_ordering_information.pdfIn PDF document text
    • http://rilenipavow.rf.gd/miracle_box_crack_2._89_free.pdfIn PDF document text
    • http://tewederukafolez.rf.gd/moto_racer_bike_game_free.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_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 5356 bytes
SHA-256: e03ca0efce72e01688740b158088bfe0f57cdba1c8b304849142e4fac78d3c29
font_01_sfnt_off00010277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 11188 bytes
SHA-256: c3c8f0e94aa356bcdd439d44d9c0114e7891d5ade2df02d2f555e48e6e4c126f

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