Malicious PDF — malware analysis report

Static analysis result for SHA-256 4161b145962e1e8a…

MALICIOUS

PDF

122.5 KB Created: 2021-01-23 07:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c0b6a2e3c8c94d08d213317533f40132 SHA-1: bcfc3077d88320275c337cd1c8cde368aabb05e5 SHA-256: 4161b145962e1e8ae94e43d770bc3faeca9205d165ce2a99aed4f274651e9e87
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a known malicious redirector. The document body is heavily obfuscated, but the presence of numerous links, including those on disposable hosting and associated with UTM parameters, strongly suggests a phishing or redirection campaign. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=vampyr+a+journey+to+the+past+third+letter In PDF document text
    • https://jaradaka.weebly.com/uploads/1/3/0/8/130813635/9f8c3cd06bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483331/normal_5fe758800d0c3.pdfIn PDF document text
    • https://site-1192771.mozfiles.com/files/1192771/annexure_6_form_for_alp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447649/normal_5ff4e45f3b45b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461505/normal_600b75a5b31f5.pdfIn PDF document text
    • https://nozudepoget.weebly.com/uploads/1/3/1/1/131163917/9b232f6e4df608a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416928/normal_60009f764361c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485016/normal_600b7c6ea8426.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411682/normal_5fdf2d8bafd08.pdfIn PDF document text
    • https://site-1247112.mozfiles.com/files/1247112/product_functional_specification_document_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402261/normal_6003985349612.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408721/normal_5fff74a1aa1f7.pdfIn PDF document text
    • http://damomemisogadex.iblogger.org/gulera.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/23811680022.pdfIn PDF document text
    • http://fasokefukolu.epizy.com/skype_launcher_old_version.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/juwijugogegijegafelavuw.pdfIn PDF document text
    • http://jalovunenenema.epizy.com/gobudevikikezexirufuno.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/73077913889.pdfIn PDF document text
    • http://zezatavaveb.epizy.com/mudesunotumokupugotox.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_off0001a71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A71F 5344 bytes
SHA-256: afbe64150ea9d854a21b483a8074f6e2b80ba1c869fe98202029552e6b6330b9
font_01_sfnt_off0001b92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B92A 10312 bytes
SHA-256: 804be96d4394a70547a4ac500bd6553efe71054d453c83f88bca6023749905bb

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