Malicious PDF — malware analysis report

Static analysis result for SHA-256 071928d20594b39a…

MALICIOUS

PDF

70.9 KB Created: 2021-02-16 17:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5f5f35d3afd645359230aa6ea20190f4 SHA-1: e732bc30c3a7151605240f3e0fa4f645ee0d64b9 SHA-256: 071928d20594b39a8d061a5810118063ca0defaae014289342e25f821c341c5e
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a suspicious domain ('bologen.ru') that is likely used to serve malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely a phishing or downloader variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://bologen.ru/strik?utm_term=the+hedge+knight+comic+pdf PDF link annotation
    • https://nogigeto.weebly.com/uploads/1/3/4/6/134665346/1022933.pdfIn PDF document text
    • http://premial.su/vebifixugokevepupijskc0.pdfIn PDF document text
    • http://nubolutlion.xyz/california_dmv_car_registration_formtmq53.pdfIn PDF document text
    • https://selamosufuk.weebly.com/uploads/1/3/4/4/134463567/jeserisezofi-takesinaf.pdfIn PDF document text
    • https://mitivowa.weebly.com/uploads/1/3/1/6/131607237/dilakogewiza.pdfIn PDF document text
    • https://fapopadiwa.weebly.com/uploads/1/3/1/4/131438416/613922.pdfIn PDF document text
    • http://totalcreditreport.info/fecha_de_carnavales_20208rqp0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nedijowewoded/cardiovascular_disease_diet_guidelines.pdfIn PDF document text
    • http://damoserik.epizy.com/13377094386.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/46819037874.pdfIn PDF document text
    • http://runugerobel.rf.gd/purixelamowabumuluw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82A 4856 bytes
SHA-256: 205317b81d166e5fd19f3e3f16125bb2a4c5f0f1a55968b2ab2bacf00dcb8829
font_01_sfnt_off0000d887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD887 12744 bytes
SHA-256: e9711436ac12b2b02a88d3379d5539d0dc2d1e74c3e4ec6eb530eb128833ffb6
font_02_sfnt_off00010128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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