Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe877c6300d65c2…

MALICIOUS

PDF

63.7 KB Created: 2020-11-16 20:39:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a7d4aafba43ca980807710761a8a696a SHA-1: adcf0f1fe898e7928ab84ca4a0e16ec6010b9b1e SHA-256: dfe877c6300d65c2b5e3933f641ad49bec1dddc38c8223fd0760e23bbb133e13
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the overall structure strongly suggest the document is designed to redirect users to potentially harmful websites, possibly for credential harvesting or malware distribution.

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://trafffe.ru/123?utm_term=pokemon+red+rom+download+gbc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f9e790dca1bd.pdfIn PDF document text
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/9620827.pdfIn PDF document text
    • https://kedixezowudogaj.weebly.com/uploads/1/3/4/6/134618790/7701165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_5f8de03f1ca87.pdfIn PDF document text
    • https://xonelaxag.weebly.com/uploads/1/3/4/7/134705152/7222803.pdfIn PDF document text
    • https://nugaridepi.weebly.com/uploads/1/3/4/4/134474671/e7e0a81b5e.pdfIn PDF document text
    • https://juzatimeb.weebly.com/uploads/1/3/4/6/134605854/6061293.pdfIn PDF document text
    • https://wusiparopebabo.weebly.com/uploads/1/3/4/5/134505529/c934eef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391303/normal_5f990799a5f53.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/5594096.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/410cfffd-bd2d-44e7-9fa3-e99fe9497f25/ectomorph_muscle_gain_workout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c836775-78ee-4da8-af0b-eb9d865f4a2b/13843719898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f52a583-a152-4220-b602-4be373ed9486/dusevovowigezavowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d86a99e3-5a79-4dbd-9393-66d5a2598cef/97028911567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/102b688c-67af-4235-be53-2dc21c6c8a5e/xemaxofeboxul.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_off0000b2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B1 5380 bytes
SHA-256: 9fc7b58eb30c8fcc649273bf209572087b35e9e2aa199fac1431a8087ae75559
font_01_sfnt_off0000c4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FC 14784 bytes
SHA-256: c1e7f37d8cbea393c09945fa74009f3bc0e3b6cf0bc6dc7635e698c7f32e119d

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