Malicious PDF — malware analysis report

Static analysis result for SHA-256 0628c3c2d09de0c0…

MALICIOUS

PDF

111.9 KB Created: 2020-12-18 16:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6e2db15184f8a827cf8f396fa0f61259 SHA-1: d6a6594cf76796e55a3b0b7dbe72f940a0270ada SHA-256: 0628c3c2d09de0c01319b927c77e66ebd33630fa036cf91121b7a94f462dede3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to TV guides and Comcast, likely a lure to attract clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/strik?utm_term=comcast+muskegon+tv+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375341/normal_5f8a8918ab97d.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/rorenexilorinuwe.pdfIn PDF document text
    • https://xesofizagib.weebly.com/uploads/1/3/4/4/134491847/748411.pdfIn PDF document text
    • https://wifajeru.weebly.com/uploads/1/3/4/3/134342489/donarorerebiximoju.pdfIn PDF document text
    • https://gavawujag.weebly.com/uploads/1/3/4/3/134370084/bf19148bb05.pdfIn PDF document text
    • https://ditowesoxuro.weebly.com/uploads/1/3/4/8/134885058/8311371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382782/normal_5fb51871ccefb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474449/normal_5fc2d23463b81.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8925184.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/f59d6664-adcd-4926-a46b-e540b6c58f61/soroptimist_international_of_the_americas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e064fa49-2cb3-4b35-9b9a-65afd266d6a4/68222520280.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/19969123463.pdfIn PDF document text
    • https://s3.amazonaws.com/pamavon/gajep.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_off0001757b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1757B 5160 bytes
SHA-256: 114b2246ef88c96df76d91fd600e4f304279375beb2b643f82bfa6d3a9a4625b
font_01_sfnt_off00018700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18700 13452 bytes
SHA-256: bf728a819e68e9148f60b3a71f66fe2408d45c3ba0241b3c94153860ca579a9c

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