Malicious PDF — malware analysis report

Static analysis result for SHA-256 485a29e59bf485a7…

MALICIOUS

PDF

80.7 KB Created: 2021-02-13 20:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4f27c2afb4e49b03173cd621cad265ed SHA-1: fafc2994f70d6e139dbd4e33998ec0284f3a90db SHA-256: 485a29e59bf485a7df74ed5a0f11d4e3f6d769d43c04a59fdb0318f056fa26a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, with one heuristic specifically flagging it as a 'link farm on disposable hosting' likely intended to redirect users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malware distribution intent.

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 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://jacksth.ru/wb?keyword=information%20report%20writing%20checklist PDF link annotation
    • http://kataeta.club/novibudinewuzajoxutakumaxsknua.pdfIn PDF document text
    • http://nutristrike-shop.ru/kopulapaduvq8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450243/normal_5ff0d9fccce0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490515/normal_5ffadadc7c594.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/non_conformance_report_excel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498994/normal_60120da47ce3c.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
    • http://mufumeg.rf.gd/59506356108.pdfIn PDF document text
    • http://tokofelutuj.epizy.com/9246958575.pdfIn PDF document text
    • http://sasoregasot.epizy.com/ca_books_icai.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/wallpaper_photo_ladkiyon_ke.pdfIn PDF document text
    • http://gadoxijumulop.epizy.com/hily_dating_app_apk.pdfIn PDF document text
    • http://dazulenaredon.rf.gd/busagavagufurogi.pdfIn PDF document text
    • http://ritarejameja.epizy.com/38726521356.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/adobe_printer_install_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/election_commission_of_india_application_form.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_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 5312 bytes
SHA-256: 20562df735d93cc4c21a2c1c982e67547a3a803837da417142aaf95518b43432
font_01_sfnt_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 10772 bytes
SHA-256: 38c9c68a3a7c2f0cab7ba512aa3c61a9c48d59094dabe44cbd31ce80e708d83b
font_02_sfnt_off000127f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F4 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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