Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c548de0560c749…

MALICIOUS

PDF

81.5 KB Created: 2021-02-23 23:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58e803571db1b2a3118c6217dc40c00a SHA-1: b03af55b528818af353c21e86515a0bc30a8e02d SHA-256: 80c548de0560c749514336abcdceda8a0268a552acf9084506e5e780bc4963bb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, with one prominent example being http://huaweistoreukr.xyz/457590813235beso.pdf. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wix?keyword=crime+scene+worksheet
    • http://huaweistoreukr.xyz/457590813235beso.pdf
    • https://cdn.sqhk.co/sumefixes/ajjyjbb/48275143445.pdf
    • https://static.s123-cdn-static.com/uploads/4481072/normal_5ff4ee41abd68.pdf
    • https://bufibetotireguk.weebly.com/uploads/1/3/0/7/130739935/7980969.pdf
    • https://cdn.sqhk.co/moturalogupe/ji5Yifb/ww2_battle_games.pdf
    • https://garasomebopite.weebly.com/uploads/1/3/0/7/130775476/82918f65d.pdf
    • https://cdn-cms.f-static.net/uploads/4374024/normal_5fdc83120ad34.pdf
    • https://cdn.sqhk.co/xadeviro/gX8OA39/59051015016.pdf
    • https://janafapaxe.weebly.com/uploads/1/3/1/6/131606835/fumidanatazogiga.pdf
    • https://static.s123-cdn-static.com/uploads/4373004/normal_5fe3fe2125ecb.pdf
    • https://cdn.sqhk.co/zikufivol/fAv3Kgh/45928821131.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010474.bin
d7a6d7640bebe76b02c197948ecac31e04b985cbfb9c6e6eebfaa079c426c83f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10474 4860 bytes
font_01_sfnt_off000114e5.bin
fa1aabe7ab75e22b5fcc330ae83fb81ee2ee431c08dbc3c58b88df1c98c2397b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114E5 10788 bytes

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