Malicious PDF — malware analysis report

Static analysis result for SHA-256 18325f3973daf1f4…

MALICIOUS

PDF

77.4 KB Created: 2021-04-16 23:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 76699a65f62c00aee45b5bbc3dac742f SHA-1: d226f4ddf2b0d2b1328a974241ba9a6ea36f07ec SHA-256: 18325f3973daf1f4d40a041ba831516ca5655c926b46461a465b111330aaf043
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, suggesting a link farm or phishing operation. The primary URL, 'https://pelibifir.ru/strik?utm_term=can+you+replace+dyson+v6+battery', is likely part of this malicious infrastructure. ClamAV and ML classifiers confirm the malicious nature of the PDF, classifying it as a phishing trojan.

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://pelibifir.ru/strik?utm_term=can+you+replace+dyson+v6+battery PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406806/normal_6066ef5b7d16f.pdfIn PDF document text
    • https://falopizesolirod.weebly.com/uploads/1/3/1/3/131379111/254496.pdfIn PDF document text
    • https://ginuwawabesinu.weebly.com/uploads/1/3/1/1/131164414/fumov.pdfIn PDF document text
    • https://vanazufir.weebly.com/uploads/1/3/2/7/132740694/2fe21071cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425784/normal_6061c70db1b4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_602da53b2e0d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_605413cb57a53.pdfIn PDF document text
    • https://sulekigotama.weebly.com/uploads/1/3/4/3/134307446/8846754.pdfIn PDF document text
    • https://vikabedegopeve.weebly.com/uploads/1/3/0/8/130874339/3880472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456996/normal_6068f63a80619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486054/normal_602b0b095a511.pdfIn PDF document text
    • https://jeludumekidi.weebly.com/uploads/1/3/2/7/132740852/d3b1acf4.pdfIn PDF document text
    • https://xitodilizunew.weebly.com/uploads/1/3/4/1/134108755/5d0c2bade7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_604e1dd3bc2f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471479/normal_604e7f614a006.pdfIn PDF document text
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/8218217.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa668f59-fc4b-44f3-b6a7-e79057d2cb9c/wisuzifepib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be3cf578-b3db-46af-bcd2-cf1a3969dd84/rakitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a867fa96-b99a-483c-97f4-4e51b95ee5e1/what_is_automatic_light_control_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7d9a47d-aaa0-43c6-926a-19acb3be26d4/96577372656.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_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 5428 bytes
SHA-256: 04be8e8c0df9dfede9b5c03881614c83899cb751caf16444e8dc117cef0e1d4c
font_01_sfnt_off000103dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 10668 bytes
SHA-256: 70379125ff6aee9a7e290d22beac137785d42ba2f9808972cc76f9edce6cabb5

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