Malicious PDF — malware analysis report

Static analysis result for SHA-256 1054d02ff5b59c62…

MALICIOUS

PDF

74.5 KB Created: 2021-02-27 01:19:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d8684075ff7287331e1c29c769b78f5d SHA-1: 37bd0d3d6c88f343865b7030001e75ca8b7d6d1c SHA-256: 1054d02ff5b59c62b05dbf1fbfb40052f92b182c37bc52052bc56e3bb72db6f7
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to distribute malicious content or engage in phishing. The document body, though heavily obfuscated, contains metadata related to PDF creation and a keyword search, reinforcing the lure aspect.

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://leonvi.ru/award?keyword=how+to+get+time+capsule+in+upper+west+side PDF link annotation
    • https://xubejuvanexog.weebly.com/uploads/1/3/5/3/135311054/9682984.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/famous_daves_cornbread_mix_nutrition_facts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375514/normal_60348fe9d0701.pdfIn PDF document text
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/4735055.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/bakejekenexusozubaledu.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/rofasazep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472783/normal_6013e96d6f9d1.pdfIn PDF document text
    • https://melesosinipedo.weebly.com/uploads/1/3/4/4/134475371/1094409.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/jbtHijE/voice_changer_for_zoom_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/1CgdSO1/3053362036.pdfIn PDF document text
    • https://cdn.sqhk.co/lixejudazeza/ajbjbhc/68836469060.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374372/normal_60099cec7bbd6.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/how_to_connect_bluetooth_to_pioneer_navigation.pdfIn PDF document text
    • https://nasavizar.weebly.com/uploads/1/3/5/3/135322571/xowojafenozupizajawa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/42742109190.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/vunimamapesugazexe.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_off0000e7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 5448 bytes
SHA-256: 3f900a9a469564b2137584bdc3554ff973e22eba7f6295ff97d99ab2c5d16f2d
font_01_sfnt_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 10180 bytes
SHA-256: b86d2ec6a3dc1399b42988308e902aa39da4eee024e9bcabe99db608ff19f5a0

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