Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b8d3bf15d7a8cd…

MALICIOUS

PDF

75.8 KB Created: 2021-05-11 18:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: dd4b96930b4931494ac8452762abf55a SHA-1: 3f235fb02fbef2c13378337553fb956521ee5c32 SHA-256: 97b8d3bf15d7a8cd99d375d155bd9c67ea63b61f349efb6e32ff0010be12e285
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf', indicating it was likely generated by a tool that converts HTML to PDF, often used for creating malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=what+is+an+example+of+foil+in+literature PDF link annotation
    • http://jewogipuwivi.medianewsonline.com/critical_thinking_translation_hindi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420029/normal_5fe41bc363614.pdfIn PDF document text
    • http://zomixuxoluzijum.mywebcommunity.org/69438134061.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/gufejovedozeso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477626/normal_5fd3cc8cd4089.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366666/normal_5fc76f5824a4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417406/normal_6027111412ca3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501503/normal_606a9e9e6b2dd.pdfIn PDF document text
    • http://getepitisux.mywebcommunity.org/numixowagagiz.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/2b0cd465-dcc1-41a3-98ee-ffceebeffcc0/rajewebigazoxubujijufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64758d39-7bca-4026-a684-921bdcdf836c/macbook_pro_tutorial_for_beginners_2019.pdfIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_388139481b8b4820bdbbd0a4aaec898c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f8da2cf-b9aa-4d25-b878-65b8749dc2c8/43819876414.pdfIn PDF document text
    • http://vidodusiv.epizy.com/how_to_not_pursue_a_man.pdfIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_0f88d71f2d264bcaa7c34f4dc4660d07.pdf?index=trueIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_72bfc7e94f594815b24db4439c23b3f1.pdf?index=trueIn PDF document text
    • https://b993c520-4fc9-488d-8dda-35d8b3dc2713.filesusr.com/ugd/6f5492_f01807042e3a466e8d3c3f82c89cc32f.pdf?index=trueIn PDF document text
    • http://nazonuretowu.epizy.com/squarespace_templates_for_bloggers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4177d1d1-9e70-420c-b43c-eaf43c539ad1/calculus_early_transcendentals_8th_edition_solution_manual.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_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 5220 bytes
SHA-256: 1c5c9bcd404684538aa3580fa4f746ae65ca1f640d4549e3c6067991eda041d5
font_01_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 10956 bytes
SHA-256: 0f6a9e7e2f64a99391509cb422bcb77d9f17a890e6faa1d43a4a5e81d620cec1

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