Malicious PDF — malware analysis report

Static analysis result for SHA-256 092a22e50dc9e1cb…

MALICIOUS

PDF

79.4 KB Created: 2021-06-10 09:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8639b9deeeb8c5c778b37da74a932398 SHA-1: c68f824e00a19d68f91dd8cae5db94eed0d9368e SHA-256: 092a22e50dc9e1cbbe1a713c78d31b95d897d68229c2731cb9dd17f6328a358e
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection.

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://huntic.ru/pbw?utm_term=gvozdeni+puk+cela+knjiga+pdf PDF link annotation
    • https://pakotoroxup.weebly.com/uploads/1/3/0/8/130815058/f30ff2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_600f5995cb8ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_5fd0d488ccca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446784/normal_602d0558a3e23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483082/normal_601e6aaf23758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5fe7ce6132cbe.pdfIn PDF document text
    • https://juximejejin.weebly.com/uploads/1/3/4/3/134365908/tigumodu_wugifonibosam_zesez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413567/normal_5ff24ee0dccb9.pdfIn PDF document text
    • https://tewonubipudi.weebly.com/uploads/1/3/6/0/136016370/1415662.pdfIn PDF document text
    • https://pebizadovabunal.weebly.com/uploads/1/3/4/7/134711288/vodizu.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4504788/normal_60b1c31e57436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451567/normal_605f6af14f82b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_60b89c6bac188.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446650/normal_5fe14a31964b4.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/f496e9a3-940a-418f-8f06-4ca063e8ed9e/what_is_the_book_acres_of_diamonds_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18bb5b48-ff1b-4f0a-b2a6-8c8f70e807b0/elk_m1_security_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e68e1fa9-4468-4566-bb80-903915ca7833/the_maze_runner_online_book_with_page_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e972e7d-91df-4278-955c-303351d9083b/basic_spanish_quiz_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_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 5328 bytes
SHA-256: ced9c0c6d17dbb98eb6aa7fa58d4ba62b8e79cead848f88d6a7c0e282d7c7768
font_01_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 11356 bytes
SHA-256: 65bb97a0fc1f71bba378127bf360013b2876c58f00f91c08f9b7ba80643b6db1

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