Malicious PDF — malware analysis report

Static analysis result for SHA-256 340e31f71ea3bb89…

MALICIOUS

PDF

73.0 KB Created: 2021-01-03 10:08:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c28ee91fd2414871edb6723ae286353e SHA-1: dca46b96180475e4e94e73d95bf2342af0456a62 SHA-256: 340e31f71ea3bb89a316a72ccb9825948f6ed28e82127741177a0aec6889add0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 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://traffnew.ru/123?utm_term=irrational+exuberance+3rd+pdf PDF link annotation
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/sapanidusakubi-nesiza-surusim-patagogekem.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/6431815.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/jogowezokuvaxu.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/011e9a10f0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384154/normal_5fa5c634cb5dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369633/normal_5fdd28f906d5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496360/normal_5faf899d24d74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417308/normal_5fdfc5f726d08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_5fa5074fe8d8f.pdfIn PDF document text
    • https://ludexibof.weebly.com/uploads/1/3/4/6/134638297/bivivasiva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422627/normal_5fa9184623f06.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/jimugivos/adobe_xd_ubuntu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cd7b3a9-7eb3-404c-95b1-07d3fe31df10/grados_de_insuficiencia_venosa.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/putivogelanoj.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_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 5280 bytes
SHA-256: 42b5671e37d42a964749838cc0453cfe48516f1886eaf5976477565b25dce5e4
font_01_sfnt_off0000f23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 10952 bytes
SHA-256: ecbb0ade2b4f8d97118d439c035367f0c6c8486f513d25504cd2791b76b8f783

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