Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d33157283c4cef…

MALICIOUS

PDF

81.0 KB Created: 2021-04-04 06:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2e078593466743fbf324001a47544870 SHA-1: 94b513a48a87a8cfac917ce87aedf6a6912d8ac6 SHA-256: 67d33157283c4cefc863fc7cbaba7a6bf5ca8e9803fe2c25384937d256409d03
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO spam operation. The primary URL, https://mezovuduw.ru/strik, suggests a redirection or malicious landing page. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://mezovuduw.ru/strik?utm_term=json+simple+java+api PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493905/normal_5fd11573736c6.pdfIn PDF document text
    • http://praktika-ingenieur.com/is_procreate_pocket_available_for_androidmthba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392191/normal_603ea878e4c8c.pdfIn PDF document text
    • http://dajobod.getenjoyment.net/botafomilu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479678/normal_605ee4f835db5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383918/normal_605ee20224e3d.pdfIn PDF document text
    • https://kurajefofukagi.weebly.com/uploads/1/3/4/8/134895289/setomatorukojijo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475847/normal_6021abc2b5824.pdfIn PDF document text
    • http://getyourscore.info/mopasulejefaks2d6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411709/normal_604736b3bb1b5.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/kewiget_kezibige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503033/normal_6029a69b5a69b.pdfIn PDF document text
    • http://fartook.online/752557478896gcxk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464863/normal_5ff16db3394a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pavabiza.atwebpages.com/cetoacidosis_diabetica_2020_pediatria.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/lonapezepodoraja.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/maps._me_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/wadejij.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_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 4992 bytes
SHA-256: 269e32bd2f2784a62fc2ad09daa7ddd935819dafc09249f4d50fdff4b184c4e7
font_01_sfnt_off000110d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D5 11188 bytes
SHA-256: 5186209a55892068eaf06d9c0675451c6c5a83c13e4925b41a5bb66aa28fd118

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