Malicious PDF — malware analysis report

Static analysis result for SHA-256 4751b2d36550054c…

MALICIOUS

PDF

67.0 KB Created: 2020-11-20 07:46:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d0cdf18059dea1a04d236fed865d383d SHA-1: d675ca3efb5249848a48c7b4b7a3806231c183e6 SHA-256: 4751b2d36550054c1f9f379dd16285658a0e4e0d25e7e39f813991313d8b5f91
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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://trafffe.ru/123?utm_term=minecraft+progression+guide PDF link annotation
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/pamipiruwezu-dimitewulu-kasafisuti.pdfIn PDF document text
    • https://bibixofepo.weebly.com/uploads/1/3/4/2/134235383/fepuvuxepagada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459629/normal_5fad2d2ee02e7.pdfIn PDF document text
    • https://dupasaku.weebly.com/uploads/1/3/4/2/134235895/vutevu-luwadufobod-pezojupe.pdfIn PDF document text
    • https://fawefugixizim.weebly.com/uploads/1/3/1/3/131383791/a70e82884e9b7d5.pdfIn PDF document text
    • https://javumegibevi.weebly.com/uploads/1/3/4/6/134634398/499429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_5f926dc1a3a75.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/mamukawaxatali/angels_in_america_text.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/cervix_transformation_zone_images.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_off0000c880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC880 5296 bytes
SHA-256: 09ec27a4bcabbbb2f05b69c05d28006df377a1ffe3a958525ee11252e5d8b714
font_01_sfnt_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 10772 bytes
SHA-256: 88c51133d7074c2a5037c958b088c62d3ec1313fc4ae983afdd5f1ad06d3a817