Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4c38d2b8684590…

MALICIOUS

PDF

75.5 KB Created: 2021-01-09 17:13:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39e6d7ccc70f80e174889d1bdf2a1c2a SHA-1: ba5943d87e6518a53147f2a2385f5dd6ae1f3034 SHA-256: 3e4c38d2b8684590b7641e48e90b3f4f1a510b55954af25471aaea312763b195
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate maliciousness, with the PDF being flagged as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm heuristic point towards an attack pattern focused on redirection and potential credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=cutco+chef+knife+review
    • https://bopifodefow.weebly.com/uploads/1/3/4/3/134383970/23f84ba.pdf
    • https://puzaloraren.weebly.com/uploads/1/3/4/5/134510283/eb062e.pdf
    • https://static.s123-cdn-static.com/uploads/4466996/normal_5fe4bb7ce5214.pdf
    • https://fujovufizopi.weebly.com/uploads/1/3/2/7/132710671/buboresufom.pdf
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/fidokukejutilokuta.pdf
    • https://lewugudufe.weebly.com/uploads/1/3/4/6/134668986/9688422.pdf
    • https://dudixugodibemuf.weebly.com/uploads/1/3/1/4/131406925/lotaxo-neximavupi-gowavunidokegig.pdf
    • https://cdn-cms.f-static.net/uploads/4388815/normal_5fbdd13407164.pdf
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/5411092.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bisazabe/new_movies_2018_hollywood_hd.pdf
    • https://uploads.strikinglycdn.com/files/94b3d939-f891-406a-8b0c-6d5db8daa1e0/foundations_of_reading_study_guide_arkansas.pdf
    • https://uploads.strikinglycdn.com/files/e6812bf2-1f4c-4679-8012-d98fbe617693/63377064094.pdf
    • https://s3.amazonaws.com/pafiganovavi/vikogawuliz.pdf
    • https://uploads.strikinglycdn.com/files/8157d7a2-d05c-4a82-9ea8-db190eb7b335/pudaponupurumutox.pdf
    • https://uploads.strikinglycdn.com/files/a6d832f1-6d2c-4af7-9f6a-9c8aaf296395/votatupuxesowu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec08.bin
0df9feb09b0e1b995ca6bb42e0f66c3c249eb2d400a5f1e049e1f3e698163b0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 4672 bytes
font_01_sfnt_off0000fbfe.bin
326560c1d5f48b0a31f3449cc83556cb84cdb51c12d30290f32e6db18b7e7473		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 11008 bytes

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