Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8b997d68a418cf…

MALICIOUS

PDF

79.4 KB Created: 2021-05-28 23:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1ee229b4241276302f546be2e20a817c SHA-1: c71f71ce15c3e0a22a0fff670725e5e40e22894f SHA-256: de8b997d68a418cffa357a17c34f6985b8223d2f185aac8c44a92da20eb02b7d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate attempt to create a network of redirecting URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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://vilenefex.ru/123?utm_term=advanced+materials+nptel+pdf PDF link annotation
    • https://toreliga.weebly.com/uploads/1/3/4/3/134335880/bezujetul.pdfIn PDF document text
    • https://jebezowurexa.weebly.com/uploads/1/3/4/5/134576847/zipip.pdfIn PDF document text
    • https://rirejanumaxix.weebly.com/uploads/1/3/4/6/134631236/9fe92605.pdfIn PDF document text
    • https://dipafasimabake.weebly.com/uploads/1/3/1/1/131164320/pasedojadabuwasubim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_602b832861a93.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/4408852.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/bokiputupipugov.pdfIn PDF document text
    • https://mevinabepoke.weebly.com/uploads/1/3/2/7/132740553/5945d7aab1.pdfIn PDF document text
    • https://wopurosifagup.weebly.com/uploads/1/3/5/3/135333772/3191207.pdfIn PDF document text
    • https://famuvotatag.weebly.com/uploads/1/3/0/8/130813835/zoxap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473340/normal_60435bc9773ca.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/bamov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489835/normal_606e7affbf2ca.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/fd92a35a-e54c-4c2d-b68f-f7bb8e305bec/84737611866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/649db274-f53a-453c-9301-5e5835c35c3c/how_to_find_out_ip_address_and_subnet_mask.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76f755f0-7dd5-4905-b3c9-c1a38957eb62/do_all_diaper_genie_refills_fit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/840d14bb-d1b2-4d08-b7da-fe22a2a2764e/how_to_change_canon_mx922_ink.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4bbfde-c70f-4574-b753-4956f6b273d8/gotezuwofipavogisodumiso.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_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 5352 bytes
SHA-256: 1f3a5186d3078c22acb223ce27f9712438acecdc5ca52e8e4d8718523f5ecbd9
font_01_sfnt_off0001084c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 11284 bytes
SHA-256: cf4053e10154cd5f4911ebe47f1c04539ed7f97bc1a8959fc5c54e91b86da6b8

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