Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e2884267efc56c…

MALICIOUS

PDF

88.8 KB Created: 2021-04-12 20:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 222b0647d758ba80609b2c580edd8b10 SHA-1: a85edfc82f176d7ff462dbcf9d6c56825b7ed34e SHA-256: e6e2884267efc56c8cbbdfc168701c58031b15abebe395ee138a2aebda09b92c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, 'https://jacksth.ru/strik?utm_term=julius+caesar+1953+full+movie+online+free', is presented as a search result, likely to trick users into clicking through to potentially malicious content. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://jacksth.ru/strik?utm_term=julius+caesar+1953+full+movie+online+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366956/normal_605845bf30b4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458421/normal_606713d36069e.pdfIn PDF document text
    • https://lepomanorep.weebly.com/uploads/1/3/4/8/134856804/ditawatizama-givexelox-rovunulu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_60434c26b14f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483097/normal_5fdbd5439002c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495841/normal_5fd61bfa2bd6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_5fdb15a3db18e.pdfIn PDF document text
    • https://zubajabazu.weebly.com/uploads/1/3/4/4/134466761/e2561.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473656/normal_5fcebe3d6aa55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415046/normal_5ff7e205271eb.pdfIn PDF document text
    • https://xaleratugigajij.weebly.com/uploads/1/3/4/6/134631249/vosidegumubawo-xevem.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
    • https://s3.amazonaws.com/roware/gujarat_budget_2018-_19_in_gujarati.pdfIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_d02f2557649b4844b92e0611b1dea0eb.pdf?index=trueIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_1c9510dfb82842d1af63141de6a45af1.pdf?index=trueIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_4e6e7eead7e74cbfaaaa40417157e64b.pdf?index=trueIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_490b5611d9354d258b48c2cc9cfd6263.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/timeziso/epson_workforce_2630_ink.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/florida_corporation_annual_report_deadline.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_off00010efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 5376 bytes
SHA-256: a046e0f423eaca34bfdd36d602e5c0c16387ba6b195f93d2fe3ee9b8c4047e0d
font_01_sfnt_off0001212c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212C 11364 bytes
SHA-256: 8df9edc67f6bdb71d79f8f28f0391aa604866bc770b0c5cf230384177d736d71
font_02_sfnt_off00014793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14793 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e