Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f7fdb1ddb2277c…

MALICIOUS

PDF

75.1 KB Created: 2021-02-15 19:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4ba023bf9c6d0873882a44c20b58e18a SHA-1: 67466c84622b1b1cfccebbe7dda02a93dbf5194e SHA-256: a9f7fdb1ddb2277c9f2dea306acc1cacefc11b89607e377d1f648fcfe2d9f1a4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

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://baarspo.ru/wb?keyword=what%20were%20the%20most%20important%20effects%20of%20the%20bantu%20migration PDF link annotation
    • http://tosety.xyz/2092421257zh2vd.pdfIn PDF document text
    • http://pr-bux.online/73971253506ykgz8.pdfIn PDF document text
    • http://sevastopol.sale/architectural_presentation_sheet_layout_templatesxwez9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368732/normal_601883edf3269.pdfIn PDF document text
    • http://all-system7.work/jidasutoj2nhq7.pdfIn PDF document text
    • http://dofegogojewipo.iblogger.org/zibarose.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476416/normal_5fc809706e97d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392463/normal_601c03f385b46.pdfIn PDF document text
    • http://rubyshup.space/29839720381i6nkk.pdfIn PDF document text
    • http://women-ita.space/dojemidajoniihmmg.pdfIn PDF document text
    • http://bivadula.22web.org/ritomoruzimelujebikekila.pdfIn PDF document text
    • https://fudukonuxevefez.weebly.com/uploads/1/3/4/6/134606022/vidobubarip.pdfIn PDF document text
    • http://lexanizisujufum.66ghz.com/60489088634.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://naxudafaxe.epizy.com/capella_university_transcript_request_form.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B1 5524 bytes
SHA-256: 300ee897fae90d7d855581e1e98da4c558a24fc11ee8813ebd383588a6b7aeaa
font_01_sfnt_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 11024 bytes
SHA-256: b1869348d4b2bd6a914c5bb7a34f248066d31335475b725cf1c917efdbaadc68
font_02_sfnt_off0001111e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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