Malicious PDF — malware analysis report

Static analysis result for SHA-256 07fc8b1d24755265…

MALICIOUS

PDF

72.4 KB Created: 2021-01-05 02:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: eef6e2e96aae42dd15e96208576172d8 SHA-1: d16b932c47cdc9642ef5c641dc545391e66ed281 SHA-256: 07fc8b1d247552651278bb2f9b5db2cb3b12dcda17320192af609b187a0059e4
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://trafffi.ru/aws?utm_term=aadhar+card+name+change+application+form+pdf PDF link annotation
    • https://rezivunafotete.weebly.com/uploads/1/3/4/3/134354631/peronuguba.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/hbBfjjV/tiny_house_builder_ontario_canada.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/9944119.pdfIn PDF document text
    • https://guxedujigizos.weebly.com/uploads/1/3/4/7/134735137/nuneroziremiku.pdfIn PDF document text
    • https://zemuxarasojutin.weebly.com/uploads/1/3/4/3/134374283/05eee47d42a47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_5f9147195cfd9.pdfIn PDF document text
    • https://taxepenobeg.weebly.com/uploads/1/3/4/3/134355702/xajuri_kisekeja_kipokonogobub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8baf9c23-54d9-4ffd-b3f5-39b8c0f115a3/11024552219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/937a8b30-d242-431c-98ea-3f80a7cd0e92/east_whittier_middle_school_staff.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a84359ad-d3bb-4378-9edd-3c39b7200aa8/lisit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac8f3a6f-70f3-462d-8620-724716efec4e/murder_mystery_dinner_party_kit_free.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_off0000de35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE35 5380 bytes
SHA-256: 6ce565e85562d41718fe2dac58d1a662872e56d9ece48039e77e6d3d65fac607
font_01_sfnt_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 10652 bytes
SHA-256: 28e2ee137c676607c847077ce137ec9218b05b9d4e079058c6e28812623a0b04

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