Malicious PDF — malware analysis report

Static analysis result for SHA-256 0328c93fb5e7b2f4…

MALICIOUS

PDF

73.8 KB Created: 2020-11-14 10:08:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a890943e8cf23fabe5c639670ccb18d6 SHA-1: b93240e51eaa54ab2df5b4e2a37714566b361bfc SHA-256: 0328c93fb5e7b2f44b346375bfe7c8e88cd53b0312d6653dd5b929e01e8b0e7e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicating a link farm or SEO manipulation scheme. ClamAV and ML classifiers identified the file as malicious, with a specific detection of 'Pdf.Phishing.Trojan'. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content or phishing 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://trafficel.ru/123?utm_term=anti+aliasing+transparency PDF link annotation
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/getemuxope_fatosob_mejije_walip.pdfIn PDF document text
    • https://vujofuda.weebly.com/uploads/1/3/4/3/134375628/5557088.pdfIn PDF document text
    • https://fopimakalegej.weebly.com/uploads/1/3/0/7/130738542/97279.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/vipepowapavopemuba.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/780096.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/ruxozukozuvazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f9e36a7a531f.pdfIn PDF document text
    • https://dosedoduni.weebly.com/uploads/1/3/4/3/134347632/b5b6f0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468823/normal_5faedb0f49101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386839/normal_5f91394dcf687.pdfIn PDF document text
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/8935168.pdfIn PDF document text
    • https://pipalilivo.weebly.com/uploads/1/3/4/3/134310902/8407602.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/82c61.pdfIn PDF document text
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/depuxe.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/fe196cde-3cad-40ce-b7a4-f5dab44d4c1a/476037555.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_off0000e2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 5192 bytes
SHA-256: fb4e2338ec0f7c3aa46982db6c3334529e1d9308399c57538a32d34ecb800962
font_01_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 11160 bytes
SHA-256: d623aa5e2201be62e9d555f3d4802e95a321e14bb57dffd5b298f10f0868b2d2

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