Malicious PDF — malware analysis report

Static analysis result for SHA-256 f199b09397798182…

MALICIOUS

PDF

69.3 KB Created: 2021-03-02 15:30:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 202afdf87845db305364dc8745da5345 SHA-1: 2026e160d3fa6a75bd2f80c266be375f230dd918 SHA-256: f199b0939779818212c9f51b3f953da7060db079f3dbc40432ebac3296c33181
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though partially corrupted, suggests a lure related to 'how to remove wax melt from burner', which is likely a pretext to disguise the malicious intent of directing users to external, potentially malicious, websites. The presence of multiple disposable domains and link farms further supports a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://pelibifir.ru/123?utm_term=how+to+remove+wax+melt+from+burner PDF link annotation
    • http://magic-spring.com/hot_springs_prodigy_spa_for_salemq40z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_60303a8adbf70.pdfIn PDF document text
    • http://copyright-services-us.com/el_hombre_mas_rico_de_babilonia_google_drived2ocw.pdfIn PDF document text
    • http://sarhello.online/41046923701jw3kb.pdfIn PDF document text
    • http://mnatural.space/dasuz6i0fr.pdfIn PDF document text
    • http://burrrhey.tech/32637215155rmrg9.pdfIn PDF document text
    • http://contentmedialiteracy.com/mijodevowofubifibombxht.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486197/normal_5fea13002e93b.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/n9jb4hi/41506555672.pdfIn PDF document text
    • http://scrlt.xyz/movie_manager_macosx5hgdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384655/normal_5fec12b2c122e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_603e3c95a1734.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384464/normal_5ff18115e918b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_6014d55cc4d07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369494/normal_5febb0bf261bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42D 5056 bytes
SHA-256: 8d9fdc458653040537f7bf491f153c98d766c5c224f3b51152c6eebad954ef90
font_01_sfnt_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 10308 bytes
SHA-256: ef04fb4afa9ff014e678e9e6ca8c0f32457e636f8d78359743e000c3c06b8ea3

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