Malicious PDF — malware analysis report

Static analysis result for SHA-256 6358521af30be7b1…

MALICIOUS

PDF

138.6 KB Created: 2021-02-13 23:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52252ae5ac95ec973d61d264c1ad2f2d SHA-1: 9df7a732608abe86ce5891179123fbae28b166a2 SHA-256: 6358521af30be7b1bd38cd1312f3dbc0918f67c6f59ae0291807d12960c26f48
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a PDF link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan variant. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=plantronics+k100+manual+romana
    • https://static.s123-cdn-static.com/uploads/4376374/normal_5fcaabb2b1e12.pdf
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/002c3a2.pdf
    • https://cdn-cms.f-static.net/uploads/4365575/normal_60251bd8bfdfa.pdf
    • https://cdn-cms.f-static.net/uploads/4368969/normal_5fea359cb2448.pdf
    • https://static.s123-cdn-static.com/uploads/4419410/normal_6002b68920424.pdf
    • https://cdn-cms.f-static.net/uploads/4482020/normal_600fd601ea9b3.pdf
    • https://cdn-cms.f-static.net/uploads/4409107/normal_600ba8597c777.pdf
    • https://static.s123-cdn-static.com/uploads/4469136/normal_5fc79a360e56b.pdf
    • https://static.s123-cdn-static.com/uploads/4424689/normal_5ff6915c11b24.pdf
    • https://supagerafigi.weebly.com/uploads/1/3/0/8/130874211/xetogu_sudujeb_nonoferubusa_mawisi.pdf
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/bidula-kamiretalunere-famepow-bemenonek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zebarufuridorur/practical_english_usage_file.pdf
    • https://s3.amazonaws.com/zuxime/cute_cartoon_pics.pdf
    • https://s3.amazonaws.com/wazotojemov/vamitatugotusifaguxugul.pdf
    • https://s3.amazonaws.com/pubopelej/waluwizajobajakijo.pdf
    • https://s3.amazonaws.com/vinejivunitego/parliamentary_sovereignty_essay.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a82f.bin
11fb124a439e529c7ec8de846456ad905e43d43423c23b05ff53ea0a3926b38c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A82F 4968 bytes
font_01_sfnt_off0001b8ea.bin
a7c085f1f7c4eb3e73f2d8b22fc74e4639138cc446d9942b9b20488acf596eaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8EA 23092 bytes
font_02_sfnt_off0001f9c2.bin
6820151f9a4816bccc9e85e605aef44ce22c8924dfcccd161584754f275bf028		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9C2 16132 bytes
font_03_sfnt_off00020eb9.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20EB9 4324 bytes

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