Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef11200d2c3c626…

MALICIOUS

PDF

76.6 KB Created: 2021-03-09 05:53:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: f83c4970b9ef03a038d0c977c1f4d1f1 SHA-1: ae1358bd791bbc622c4332090c331c9b7c3bb417 SHA-256: eef11200d2c3c6263048b99218fab5142c40a640e2fa75a44c89003d9ff8154e
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/wix?keyword=chiyoda+double+watch+winder+manual PDF link annotation
    • http://kozidozilujivox.getenjoyment.net/what_are_jobs_daughters_names.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486374/normal_60062a51a01bd.pdfIn PDF document text
    • https://sisezapude.weebly.com/uploads/1/3/1/3/131398367/9870453.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/830385f415369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475197/normal_6041933dc7ced.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476268/normal_600fe7be932bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_6018a6781ff68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451220/normal_602dfa2868e58.pdfIn PDF document text
    • https://gebodakejodige.weebly.com/uploads/1/3/4/3/134316683/8f8ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_dd6bdce2c1d1404ebfa71174cedf517a.pdf?index=trueIn PDF document text
    • http://lovusado.epizy.com/marawetanatabojakumax.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/serta_motion_essentials_3_headboard_brackets_installation.pdfIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_e8c0facd84954495bc34e3b0c3ed2316.pdf?index=trueIn PDF document text
    • http://wazubumuxige.rf.gd/atwood_g6a-7_gas_valve.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_25aed8dc600747c88fb22573dae50926.pdf?index=trueIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_cbff8e3ac9a448b4b52c1db1098d4c09.pdf?index=trueIn PDF document text
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_bd4f17e8fa674ae39ab6d6d841243093.pdf?index=trueIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_c9436209c39e407aa1cffb48378ee8fc.pdf?index=trueIn PDF document text
    • http://jeborawaleko.atwebpages.com/2520612547.pdfIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_e914039ac8034baf99c141682841be46.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_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 5240 bytes
SHA-256: 91233f5d5a6fcd9c49cf43b3060a0d2b0fa48b5a49d19f81abcd5bc1fe9ead2a
font_01_sfnt_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 10712 bytes
SHA-256: b887f93812138f67b6fe6d8f8e78f9d5eae2f417793c3cec6af3811e37be86d3