Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c36cf4000fcd6c…

MALICIOUS

PDF

71.3 KB Created: 2020-12-21 19:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1a21fbef6b9c3ca0f85cceabeb0b9097 SHA-1: e4bfc202ad8affe36096f7c268cd555abc29179b SHA-256: b0c36cf4000fcd6c9fbaaada5b0437a10749b4887bd0e6e3627555f4af9ece8b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is traffking.ru, which is likely used to redirect users to further malicious content or phishing pages.

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://traffking.ru/123?utm_term=little+martin+guitar+forum PDF link annotation
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/balobem.pdfIn PDF document text
    • https://mowazaxof.weebly.com/uploads/1/3/4/7/134704653/lutepubeb.pdfIn PDF document text
    • https://newogofifexepe.weebly.com/uploads/1/3/4/8/134884114/7958233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483604/normal_5fb98c297b930.pdfIn PDF document text
    • https://nubenitenaw.weebly.com/uploads/1/3/4/0/134016689/gixiku_vuwuguzale.pdfIn PDF document text
    • https://mawurimi.weebly.com/uploads/1/3/4/6/134661678/gumoz.pdfIn PDF document text
    • https://wotilawijuv.weebly.com/uploads/1/3/4/8/134852567/didiwarunujijigidori.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc1b82e11f6a419848b6c75/t/5fc6e7642ac13f1ee9abbdbf/1606870885506/56250245098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69540166-e36f-4a80-b7c6-35fcf681bd44/naruto_shippuden_capitulo_501_facebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1236c71f-1282-40f4-abd8-637bb98ddb1c/ralph_breaks_the_internet_easter_eggs_crazy_nate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a11204-6fda-416b-9676-9d2b1c351ca0/sojabezikoratuduluzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab85b51-fc24-4a21-b2ff-a8f26c1c1b69/lazy_mans_way_to_riches.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc540ba116eb00e3c6894fa/t/5fd6c9bf7fc52c206934624e/1607911871836/password_reset_disc_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_off0000db25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 4852 bytes
SHA-256: 380bbdea3923f58e2e610fc0cb77fe153a5019466cffa9846a15bc285334611f
font_01_sfnt_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 10948 bytes
SHA-256: 3f1d769edaa6aa23eaf7b043df253e2b01a1f5bd33b0b8d76b1962b5b39351c4

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