Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e84b90c86e3f88…

MALICIOUS

PDF

69.4 KB Created: 2021-01-31 09:21:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 44295d956b709080ddd83c57068031e7 SHA-1: 349fb6ef8b6437bb8c3c44d058c4998519534e34 SHA-256: 49e84b90c86e3f888f801587d85c66a20e1137478f50cabc8403dc328d3b4206
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a primary one pointing to 'trafffe.ru', suggesting a phishing or malware distribution lure. The presence of a link farm on disposable hosting further supports a malicious campaign aimed at redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=gun%20x%20zombies%20apk%20mod PDF link annotation
    • https://cdn.sqhk.co/tomubozes/cdZ4ayc/farm_animals_storytime_craft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530846/normal_600ed5c93f26a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494433/normal_5ff6d2dc365fe.pdfIn PDF document text
    • http://rotixumuzu.22web.org/xabaguresedigezupufu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384318/normal_600075f9e950c.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/tudawufed/kafelirumipubufipi.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/gagome.pdfIn PDF document text
    • http://bulagim.epizy.com/dumplings_sydney_broadsheet.pdfIn PDF document text
    • http://lexojowal.epizy.com/93466643575.pdfIn PDF document text
    • http://xamunenefo.rf.gd/o_saki_saki_song_8d_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/86996773704.pdfIn PDF document text
    • http://femodizabofowu.epizy.com/49092548714.pdfIn PDF document text
    • http://siwebojik.epizy.com/fisedamatokefufi.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_off0000cdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBF 5328 bytes
SHA-256: ae4c47ab5d76f9a377bde02f8a50fb86753920256f0a3ba6117ed181be752d7d
font_01_sfnt_off0000dfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD3 13136 bytes
SHA-256: 6908e1956080262cb3bf180a36d9e530dafbe86257abed252b35085ab7145bfa

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