Malicious PDF — malware analysis report

Static analysis result for SHA-256 79befff7dee340f7…

MALICIOUS

PDF

72.9 KB Created: 2021-02-19 01:29:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a9a0408c38e5ddb0fa0ca91e79cedce8 SHA-1: 2608ab7a34e3d246871b4940234e8c6cd3e8de94 SHA-256: 79befff7dee340f7357f3f9368bf435655832d718315ffa5eedce93139aa9047
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or link farms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

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://jottigo.ru/strik?utm_term=international+4300+turbo+actuator PDF link annotation
    • https://cdn.sqhk.co/noperizapewo/hgujajb/72762199557.pdfIn PDF document text
    • https://tezijiso.weebly.com/uploads/1/3/4/6/134690371/567369.pdfIn PDF document text
    • https://tawozajoruje.weebly.com/uploads/1/3/4/3/134314125/6fdb1daa.pdfIn PDF document text
    • https://diwimiwiwomenen.weebly.com/uploads/1/3/0/9/130969795/dogulolivem.pdfIn PDF document text
    • http://udilische.club/sawaxobanesikenapita3xno2.pdfIn PDF document text
    • http://jirafka.space/affidavit_of_informal_marriage_form_tdcjo4pc2.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/eighfhc/12523142505.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/bhdzBeX/arijit_singh_songs_mashup_mp3_download_2018.pdfIn PDF document text
    • http://copyright-supporthelp.com/woodsmith_magazine_download1fxll.pdfIn PDF document text
    • https://takatika.weebly.com/uploads/1/3/4/6/134605824/rejowurevude.pdfIn PDF document text
    • https://wawenefawopi.weebly.com/uploads/1/3/4/4/134494228/168073.pdfIn PDF document text
    • https://resivoviwogo.weebly.com/uploads/1/3/3/9/133987135/juludefenazu-xikuguturag-roguvuxakebam-mawutakaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 5088 bytes
SHA-256: dc5259f9e6d7fa2d174ab4255802004676e362826241d0102b8d1da662d227cb
font_01_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 11180 bytes
SHA-256: dce4fd05e333b4b33e8be93aa9601af0e32933ea801ff6babc5d99d0b6a13527

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