Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ffd14cfc8480d79…

MALICIOUS

PDF

67.0 KB Created: 2021-03-06 14:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3ba4d39c9cfc81ddbb9cbba3976d8df0 SHA-1: 2fefd2a9d43a1e5576509f8b7b3c90911e898825 SHA-256: 0ffd14cfc8480d7901eab1676b588b688c25dddc808c9984e30ce6e84859a623
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links disguised as a grammar exercise. The PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicate a high volume of links pointing to potentially malicious or ad-revenue-generating sites. 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://fokemale.ru/award?keyword=mixed+verb+tenses+exercises+grammar+bank PDF link annotation
    • https://witomoniwitu.weebly.com/uploads/1/3/5/3/135317652/fexoda.pdfIn PDF document text
    • http://yazansoft.com/nebibatuxiwuzidax0c6df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366360/normal_5fe2764b581d5.pdfIn PDF document text
    • https://xibimitavidin.weebly.com/uploads/1/3/1/8/131871740/bojizumosuxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408866/normal_5fe437b350922.pdfIn PDF document text
    • http://osthondroz.com/advantages_and_disadvantages_of_lifi_technology6nydx.pdfIn PDF document text
    • https://wufodosutitivo.weebly.com/uploads/1/3/0/7/130739718/416b9915ef71fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_a1fb46c978244edbbd7a50d56f46006e.pdf?index=trueIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_8b802cbcc3204b159052ac437dab9751.pdf?index=trueIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_cd3daea5ba124f3c9789caf468f89b10.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b466f358-0066-4aa0-bde0-b6282f3f83e2/honeywell_8000_setup_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbae0a0b-e672-4ada-9c97-ccb776f27d4f/my_dog_essay_in_english_for_class_1.pdfIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_fed9327bfb4540eb808a17afe42c72f4.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_a266baf118124a82a412c604f639646b.pdf?index=trueIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_94de616ea72146caac97816c14ccba55.pdf?index=trueIn 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_off0000c936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC936 5564 bytes
SHA-256: 68a6490fc72dbea774781fe07a11f1bbac806b7020ba59a7fe78eab6500983d9
font_01_sfnt_off0000dc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 10268 bytes
SHA-256: e51af9338aed167ce7f98e13ddbdf3f98fa07432de07c03c4ec24f9ac71fb15f

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