Malicious PDF — malware analysis report

Static analysis result for SHA-256 be92c46bf88cf47e…

MALICIOUS

PDF

85.3 KB Created: 2021-02-22 06:38:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: e3a3ec5e4fc1f31706195dc53d5df7d1 SHA-1: 9fb1efa1134e7c7954d36eabb2b353fedf37a244 SHA-256: be92c46bf88cf47e902e5e091892e9e5ea44b88e5ce3ccb9c43e48a2e19d0a8a
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=surah+yasin+ayat+36 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417308/normal_5fc5edb76d736.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488335/normal_5fddbf0fb17d1.pdfIn PDF document text
    • https://gitakitopawal.weebly.com/uploads/1/3/5/3/135325500/353c8.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/Ts0iikN/26260174330.pdfIn PDF document text
    • http://copyright-help-center.com/74362066081q4q5j.pdfIn PDF document text
    • https://sibetufubexab.weebly.com/uploads/1/3/2/7/132712005/2d423d40f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418557/normal_600a8e7d56353.pdfIn PDF document text
    • https://kawuzuvom.weebly.com/uploads/1/3/1/3/131379118/lifupefugifelof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473651/normal_601f52ebd178d.pdfIn PDF document text
    • https://dibevapanowodi.weebly.com/uploads/1/3/0/7/130776811/d466fcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414852/normal_60312da19a566.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011810.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11810 27064 bytes
SHA-256: 0ef5ebbde23e57c21d69efd5f67a33bb400bf5f6aa1d763d8c01e5684f7c7881
font_00_sfnt_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 5264 bytes
SHA-256: b966ad30ddda1591b97c969abc4c7d6d9f96c3122903ab1e924771cd22207c83
font_01_sfnt_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 10228 bytes
SHA-256: c225fc8903164e5dfda94d1ecd9d092ee45b6c389c1e8ec88e497f2d22513100

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