Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4c24a45ec33153…

MALICIOUS

PDF

78.6 KB Created: 2021-04-29 11:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d7020136651c4a7b9afbdac1ee3f26ff SHA-1: 9929b1579a12a9aecd4d5b1f68c028d9e324b4c5 SHA-256: 8a4c24a45ec3315312d270253465e02336b80a5356de8097f82ecd9edbab4699
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farm attacks or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to drive traffic to external resources, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=kenmore+series+600+washer+reviews PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408864/normal_6028185759081.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/pdYeyhh/message_alert_sounds_for_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_606dc5e826071.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468261/normal_5fe25ade19e1f.pdfIn PDF document text
    • http://gepanukotex.getenjoyment.net/ikea_catalogue_2020_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_6030710ea8e60.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/hamHgdX/zoberabitutuvurirepejesi.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/wovitiku/40406126653.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/snakemake_report_example.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/tafol.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/chembiodraw_ultral_12._0_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/bantai_new_song_machayenge.pdfIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_54b4174f27d64155807590984e10ce6b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lewuli/35678871574.pdfIn PDF document text
    • http://juwukopegonamu.onlinewebshop.net/business_process_reengineering_journal.pdfIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_eddc354862ba4ec88b7baac3246af755.pdf?index=trueIn 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_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 5308 bytes
SHA-256: 5ac5cbf406bdb9092cbc63a9c8c4873fd3f60de3aea1c9e483ad58d4d60e3dcd
font_01_sfnt_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 11492 bytes
SHA-256: 1239f10606e26842011d761b1089f78355f9eb3b7b6c9d92cfb3e0df348933fe

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