Malicious PDF — malware analysis report

Static analysis result for SHA-256 510c26af9fef75c4…

MALICIOUS

PDF

76.1 KB Created: 2020-12-15 20:58:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 21e50beac87cd1e8b3f396e2197e3f0f SHA-1: 832e3055812dfa3de0c15c4c9d74a66bd076bbd6 SHA-256: 510c26af9fef75c41e85c958e0bb2297e8bfab3d92b370771ca2828bfe2c2dd1
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. The primary malicious URLs identified are traffmen.ru and a Weebly hosted PDF, suggesting a phishing or SEO poisoning campaign. While no scripts were directly extracted, the nature of the embedded links and the ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=mhw+canteen+ingredients+checklist In PDF document text
    • https://rasuzumiketasak.weebly.com/uploads/1/3/4/3/134393825/kerijunero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410722/normal_5fa45042377ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f980b14b9954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462976/normal_5faf4f15df90d.pdfIn PDF document text
    • https://pevexozu.weebly.com/uploads/1/3/4/8/134857768/desuma-julawugog-pawego.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/africa_historiography.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/7866017815.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/nezeguzipod.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/free_collaboration_contract_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/nujegefemuri.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/vizivawo.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/xumadew.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/custom_action_bar_android_example.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/limbless_reptile_crossword_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/73733116751.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2fc780b6b03258f43150d/t/5fc515449ee0f32b87f4e948/1606751561598/27071962621.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81F 5364 bytes
SHA-256: 31e2e11612dcdb7133bbff547cdad32425ca906ec8ee7ac837bc38508e407fb3
font_01_sfnt_off0000ea73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA73 10580 bytes
SHA-256: 4947ec9c739b8aa53a085de7e9c088e34a1aba0060f8f664c4dd8f2ea4cf334a
font_02_sfnt_off00010e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E66 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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