Malicious PDF — malware analysis report

Static analysis result for SHA-256 de60b4616455f73f…

MALICIOUS

PDF

106.8 KB Created: 2021-02-27 10:02:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: eeab25034b85d2a0313bec6d838a128f SHA-1: a77554f5afc72a2d4836a96ab45706e124df8d6f SHA-256: de60b4616455f73fdc11f1e1e157433133a2ae3425fb10d993b41e1f86997ecd
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 pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://golowaki.ru/strik?utm_term=the+overspent+american+documentary PDF link annotation
    • https://lisogawe.weebly.com/uploads/1/3/5/3/135312855/4358737.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416128/normal_5fec99c90b73e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486743/normal_602ca10471a8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373304/normal_5ff69f68d7a3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467318/normal_5fffb51d0320b.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/XhclSpA/azamara_journey_refurbishment.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478414/normal_6019b9b92493c.pdfIn PDF document text
    • https://lifezudo.weebly.com/uploads/1/3/0/7/130739479/508a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402711/normal_603072401e1bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480403/normal_5fd177e81c925.pdfIn PDF document text
    • https://zabojipenow.weebly.com/uploads/1/3/1/6/131636987/6725842.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuwomotibinifen.rf.gd/vivaldi_android_2019.pdfIn PDF document text
    • http://zulidemuw.epizy.com/exam_master_december.pdfIn PDF document text
    • http://zonidagaxa.epizy.com/17845753679.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_off000165a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165A7 5392 bytes
SHA-256: 9dd921f941713b3d04d2b3c37c42498c5ae4f09fec747e00738e863dc999234b
font_01_sfnt_off000177dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177DC 11220 bytes
SHA-256: 876b1e28167f70fd08097a76683285e7f5c08c52566f50c45e866d1b3ccdcd17

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