Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e71e6266cc64e2c…

MALICIOUS

PDF

91.4 KB Created: 2020-12-04 21:06:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1aefe3fcc6bb6c33b5048cdb4ed2a74d SHA-1: d8d42a8583f097613434ffa7843c9ba497b1e55d SHA-256: 8e71e6266cc64e2cb5cc35d6a08f26ee0d333d0ab6fe643a6c8335301db937b3
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 0.9998

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/strik?utm_term=twin+peaks+access+guide+pdf PDF link annotation
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/rolefajotar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450440/normal_5fc59cd4e1518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417527/normal_5fab9f0ef0bb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381988/normal_5f8f4b9772132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444622/normal_5fa76b0cbd732.pdfIn PDF document text
    • https://kukevukoleguko.weebly.com/uploads/1/3/4/2/134265740/pobip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369162/normal_5fae268431e23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5f8bc5c672676.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459320/normal_5fca4bff3086b.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/moxafed_bibowiputajag_davifowo_xinajepup.pdfIn PDF document text
    • https://tiluzapibijodok.weebly.com/uploads/1/3/4/2/134265907/kawab-bevuresurajivo-bolek.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/tudawufed/arctic_silver_adhesive_datasheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eacbc14dfd36fef1915a/t/5fc86a0943b29e7a5af4f43e/1606969866978/polaris_550_indy_adventure_155.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d8fc0b6b03258f35503a/t/5fc172ef9b1ed0353812c399/1606513392697/69066149475.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_off00012a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A74 5300 bytes
SHA-256: c4508c966b62f020583ae03537d394da7ac86ebd6b89ed640b3009bd9540560d
font_01_sfnt_off00013cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAB 10900 bytes
SHA-256: 297b4e4538f6acc6c2d655029cd8974001063548fbbf90cc0f644ff86110b5d1

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