Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f355b09056f257…

MALICIOUS

PDF

71.8 KB Created: 2021-01-14 10:56:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b6ac08d33f092fa5e346748dbc4e1cfe SHA-1: 59c1676cffec6b2a5cbef8fbcf35cb832f45ea07 SHA-256: 71f355b09056f25779bbb16be3ee0ff3351fb6e7fec51aee8a527cfec79ac111
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to updating Google Apps, likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/aws?utm_term=actualizar+google+apps+android PDF link annotation
    • https://cdn.sqhk.co/wuluzajiroz/jpejhxD/34360602012.pdfIn PDF document text
    • https://bewokeramubi.weebly.com/uploads/1/3/1/6/131636949/xupabew_lafifa_livarejafoj_batividapejosaf.pdfIn PDF document text
    • https://site-1166618.mozfiles.com/files/1166618/makerbot_method_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/rozopebak/W9bJ5hz/yellow_line_road_sign_meaning.pdfIn PDF document text
    • https://site-1194807.mozfiles.com/files/1194807/blockman_go_hack_version_download.pdfIn PDF document text
    • https://site-1166671.mozfiles.com/files/1166671/16474138395.pdfIn PDF document text
    • https://gekubele.weebly.com/uploads/1/3/2/6/132683169/8481091.pdfIn PDF document text
    • https://site-1175261.mozfiles.com/files/1175261/ar_catering_food_truck.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/foveko.pdfIn PDF document text
    • https://jemogofeti.weebly.com/uploads/1/3/4/0/134042608/gidemusiro_jazirug_rajaderatex_jenatusoduguze.pdfIn PDF document text
    • https://cdn.sqhk.co/mozopojugode/UVgdifW/vodagegaxulukiwalug.pdfIn PDF document text
    • https://demepitogiwod.weebly.com/uploads/1/3/4/0/134097880/kupanarej.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/jasadavebaga/29417588312.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_off0000db13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 5280 bytes
SHA-256: f8a00c52437a879c74e4a6e7a081678785c7fed55bde2dbd052f01857bffed4b
font_01_sfnt_off0000ed1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1C 11084 bytes
SHA-256: 5af9bdfd14c2d49cec4610c46ad7b5eec599278fc16691ac6a93153859d927cc

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