Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba262d273bb3fd2c…

MALICIOUS

PDF

72.9 KB Created: 2021-01-27 04:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: db6aff7a43eac5a8bc3ac0537b39e01a SHA-1: 054a036adc87e286d29980502e4628672f45d409 SHA-256: ba262d273bb3fd2cbb022597716ebc40c89d0f59cc9367713a02ac84a6101e9e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document's structure suggests it's designed to manipulate search engine results or lead users to malicious 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://bologen.ru/square?utm_term=business+english+vocabulary+books+pdf PDF link annotation
    • http://zalavsky.ru/mulumelijatujerovigufewa9lfw0.pdfIn PDF document text
    • https://nukofagola.weebly.com/uploads/1/3/4/8/134883999/fazanavexemuxuv.pdfIn PDF document text
    • http://vengriya.space/64100145991yrluj.pdfIn PDF document text
    • https://misetibu.weebly.com/uploads/1/3/1/4/131438078/dizizotosamisim.pdfIn PDF document text
    • https://zudimawavisutet.weebly.com/uploads/1/3/1/6/131606198/608af3e3.pdfIn PDF document text
    • http://rameautbxy.space/java_tutorial_free_download_ebook143vv.pdfIn PDF document text
    • https://lupunudarowujak.weebly.com/uploads/1/3/4/5/134599946/jamatulutamu-kupurobetipujuv.pdfIn PDF document text
    • http://auto-fishing-rods1.club/rebijafuxamojemi3tl.pdfIn PDF document text
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/5504919.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/4086750.pdfIn PDF document text
    • http://milanbeach.fun/saritedokizugelxf5d.pdfIn PDF document text
    • http://italylife.pro/74244970522c058o.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/word_board_ideas5cv94.pdfIn PDF document text
    • https://wakejowedab.weebly.com/uploads/1/3/4/5/134599651/lejojesamagano.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/dinigugaxej/11377111729.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/nuralulabanolovi.pdfIn PDF document text
    • http://mudozegiviw.epizy.com/bidabimenopaf.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_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 5832 bytes
SHA-256: b2056b1ae62fb9a11d17026d4d8d4bcdeb0f936e660ec6c84758aab3624c8a42
font_01_sfnt_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 10116 bytes
SHA-256: 04a9b76e675c68f4fe9738024620a9f56fde9dfa075af8cb20fed9650a687723

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