Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc8762812c08718…

MALICIOUS

PDF

66.9 KB Created: 2021-01-01 00:31:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 515e7a82d55a45317fef2c4b1e00c458 SHA-1: 1a125e2c7857ccb017c91d9919e2ce51c50ba792 SHA-256: 3fc8762812c0871870b110d41586361c9edd04d77aeea60a22d80c4303ce6c0d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/123?utm_term=mighty+beanz+star+wars PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404755/normal_5fe93f0083049.pdfIn PDF document text
    • https://tunugezujemis.weebly.com/uploads/1/3/4/3/134307821/5604201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457011/normal_5fb8b2f40583c.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/53bfa.pdfIn PDF document text
    • https://sujexixapobitu.weebly.com/uploads/1/3/4/3/134328704/guluvavexenapifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405899/normal_5f993261f1883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490757/normal_5fd9a63bb4f33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_5f96709fc9914.pdfIn PDF document text
    • https://pomudada.weebly.com/uploads/1/3/4/3/134382041/7295150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409623/normal_5fa6cfa260bd7.pdfIn PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/20d062c2b.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/purawuma/yankee_doodle_trumpet_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d96cd90-1d4a-4dde-8cdd-66992913231f/43234634464.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/wimozax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8b8b675-65cd-407a-9ec2-514a6967a937/flow_depression_app_review.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_off0000c65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65C 5304 bytes
SHA-256: d23684e4d40faedb5040d575bd51bf12c5ec09e441db726545064db25c9114c8
font_01_sfnt_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 11368 bytes
SHA-256: 283cca5ee1c212458288ebe70ec79996e92349b89e0da85c108f9f95f247249a

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