Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cb2616c44e1997…

MALICIOUS

PDF

57.6 KB Created: 2020-11-23 09:03:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 76f38bb942dee250069713605f51cf95 SHA-1: 7fca0388c5f2dde28be9b292df6fb4b87497abab SHA-256: 90cb2616c44e1997f7408a2d6abdfb1ab014e8588bb9b8edace17cf2cb11aea9
186 Risk Score

Malware Insights

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

This PDF file is 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 spam tactic to distribute malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/aws?utm_term=spiderman+logo+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f986954523d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388629/normal_5f9c44a911295.pdfIn PDF document text
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/jisikatafefubisedese.pdfIn PDF document text
    • https://fixumimudojuzu.weebly.com/uploads/1/3/4/6/134607797/1ad8e.pdfIn PDF document text
    • https://palarijebatexo.weebly.com/uploads/1/3/4/3/134338538/rotonifigojujen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387052/normal_5f8ebd26d49c2.pdfIn PDF document text
    • https://rubisese.weebly.com/uploads/1/3/4/5/134589844/sebumozakoneko.pdfIn PDF document text
    • https://labisafedowep.weebly.com/uploads/1/3/4/7/134722654/jejesudidined.pdfIn PDF document text
    • https://jelosixonov.weebly.com/uploads/1/3/4/6/134666827/nomawimolevaz.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/rodakarugupoko/osrs_99_crafting_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/93837973653.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/12452822921.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_off0000a737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA737 5204 bytes
SHA-256: 6ba685af914da8b404bf107d27b91eb527dd2a5097e23c45f9e530158553db19
font_01_sfnt_off0000b8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CE 9800 bytes
SHA-256: b6b2df1d3269f5bd45b884e68514acd1e7861af86b95b8c861a6c9cb0986c4c2

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