Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cdc31491be9c75…

MALICIOUS

PDF

64.0 KB Created: 2020-12-02 17:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 881cc10a27e4718f245fdff8a7f3d3dc SHA-1: d731e2e3c438894316b101a024d21a28f1db63e4 SHA-256: b5cdc31491be9c75a57fc018c64fd265bab76b767cc1945ba59d553062ab6d05
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/aws?utm_term=alcatel+link+zone+mw40v+user+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444623/normal_5fbadbcfafb16.pdfIn PDF document text
    • https://besajovepew.weebly.com/uploads/1/3/4/6/134633036/gibosujenujib.pdfIn PDF document text
    • https://revejoduxu.weebly.com/uploads/1/3/4/2/134266419/wajawogevu.pdfIn PDF document text
    • https://govumubi.weebly.com/uploads/1/3/4/3/134349805/9746166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f88b1ae79fca.pdfIn PDF document text
    • https://zitidatuviwe.weebly.com/uploads/1/3/4/4/134493200/dupevutasi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384150/normal_5fc601d31eade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_5f8ca6bd4a6f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469136/normal_5fa3d4df4c368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388617/normal_5faeab1eb365c.pdfIn PDF document text
    • https://jojawetoterul.weebly.com/uploads/1/3/4/4/134404105/5a7c534b92.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/nonipesikiri/xofuwurujowaxuj.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_off0000be94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE94 5432 bytes
SHA-256: 46b1a36f5b593c556d05377482fea81eab04cdfe89f5c2d177c06242ca0390d3
font_01_sfnt_off0000d11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11E 10116 bytes
SHA-256: 2a8a2814332fcbcac7543d541ca1dedb0856b4126ac35518f1ab15c2e9e80ab1

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