Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7bb86bd02995b6…

MALICIOUS

PDF

69.7 KB Created: 2020-11-18 08:15:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8c02533fd80af3ccf87967d9c5c517ff SHA-1: 9b62da889281fda7bcba4d7f86f1b6adc300f818 SHA-256: af7bb86bd02995b6dee72a14775eb96a06dea78c6701ce843b7c0934d4edf160
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 0.9997

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://trafffi.ru/123?utm_term=when+god+made+you+lyrics+pdf PDF link annotation
    • https://poxozebirineba.weebly.com/uploads/1/3/4/4/134447173/pukanufiralereke.pdfIn PDF document text
    • https://wekijoborumotis.weebly.com/uploads/1/3/4/4/134484899/lugodulasugubo.pdfIn PDF document text
    • https://vupolape.weebly.com/uploads/1/3/4/7/134749420/xitovupovafe.pdfIn PDF document text
    • https://nuvosukive.weebly.com/uploads/1/3/4/7/134718285/d2fb520ef8166b.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/wuloxogujot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_5f8f65a2cfd7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_5f88b6f1e7c30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8a815f2c-4843-4158-9fe5-ea9db3c6c9e7/tudirep.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/26769792384.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/autocad_elevation_drawings_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/15962837140.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC631 5488 bytes
SHA-256: d33165c9e898e015a048194e6746c9d9a49b1c377f36dd1eedb857b94db3733c
font_01_sfnt_off0000d8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B4 10404 bytes
SHA-256: d7376f0d7b0295452e8dc5db843cf2298251260c88f2628222116d04145717bc
font_02_sfnt_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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