Malicious PDF — malware analysis report

Static analysis result for SHA-256 01357fd0228fb920…

MALICIOUS

PDF

62.1 KB Created: 2020-11-12 20:13:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7a512004bb9f08f8d8cc17bd68bf0fa0 SHA-1: 8ea7aa6dcd6eed84cb008bb96c1e5963c21d8270 SHA-256: 01357fd0228fb920123e1c1046279152df4f29ab73e5c1dd3bb1db8ccf3f349f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to link farms and potentially malicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of a URL like 'https://traffnew.ru/strik' further supports a phishing or malware distribution vector. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://traffnew.ru/strik?utm_term=kindle+fire+10+manual PDF link annotation
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/9373972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_5f8aef3378acd.pdfIn PDF document text
    • https://damitonamusu.weebly.com/uploads/1/3/4/3/134306925/762272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379974/normal_5f9b6faedfcd0.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://uploads.strikinglycdn.com/files/7018e8fe-adbf-4c12-862e-76a67ab9ba04/6925309738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a00e706a-c995-426d-9488-42889504af6d/jaxinefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf2bf9a1-998b-4f53-ab5d-39150b189a18/wesawajezuveja.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/shree_devi_bhagavatam_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8393d3d5-b52b-41cb-9a4e-afaa9b301ab4/95866452657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f9dc234-636f-4538-b7be-44a74d4147f9/kumuxotuwopaduvobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e34187-65b7-4487-8d2a-08e4ffdb4b4b/skyrim_animation_bsa_files_download.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_off0000ace6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE6 4728 bytes
SHA-256: 0384464f19d25570c58a34f006751197027f359c5985865b6f342a7b13bcd0b0
font_01_sfnt_off0000bcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCE 9708 bytes
SHA-256: 6a08b241a2d9db954e6585dbfa0fe694b0f332091de8b0d5a88eba7ccab768f2
font_02_sfnt_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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