Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08830186ea3b361…

MALICIOUS

PDF

81.4 KB Created: 2021-04-24 00:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8e3323a46c4a1810b6c454b11c6fad7 SHA-1: 50cf1398549a82b5ea93c5975fb79413af9e40f6 SHA-256: a08830186ea3b361e1e394a630922d6e741fffcb4bab73b4e45a58319eab8879
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

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://kuzutuzo.ru/strik?utm_term=cannery+row+book+club+questions
    • https://cdn.sqhk.co/benanejufa/eSIWodh/womikugugidabuwo.pdf
    • https://cdn.sqhk.co/vovewotutal/uhihdge/50223704330.pdf
    • https://cdn.sqhk.co/guposidum/azge3jj/rijopejelurowokedokegusol.pdf
    • https://bemagage.weebly.com/uploads/1/3/4/5/134525224/90c8127aef75.pdf
    • https://cdn.sqhk.co/sesekopusoj/wvgfChf/bikukif.pdf
    • https://zulufiki.weebly.com/uploads/1/3/4/6/134662959/tinodukuru_zisobolum.pdf
    • https://vesokawewewavi.weebly.com/uploads/1/3/1/3/131382886/632fef013512b28.pdf
    • https://xinosete.weebly.com/uploads/1/3/0/9/130968926/xevefonudeforij_fipugamaxofi_detisiferas_xulodi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_0d8f4db42d764114ad2354ee222ce0fa.pdf?index=true
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_15e3f9c9eaeb4d2ab96ea4d2f2676d6d.pdf?index=true
    • https://e6a48395-9ebc-465e-8505-c4b20d7b8e72.filesusr.com/ugd/81e12b_f05354b6a43948c19b574de3d5783c7d.pdf?index=true
    • https://s3.amazonaws.com/nalifij/espn_fantasy_football_cheat_sheet.pdf
    • https://s3.amazonaws.com/kulinisokakewi/silicon_valley_episodes_free.pdf
    • https://uploads.strikinglycdn.com/files/b9e784ed-e7e4-4daa-9ed8-c0e741afa0b7/24981868388.pdf
    • https://uploads.strikinglycdn.com/files/f5063d8d-e074-479d-a9a8-a0ae5a8d0882/15061055365.pdf
    • https://uploads.strikinglycdn.com/files/9629206d-351e-4c82-93f3-8faec7d5d679/seratiku.pdf
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_b7c477e47fa44e8f83bdb91d9bf69180.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b0.bin
cd69da6fc94b710e455700d82fcec4bfd765592e76ebb7288e24c4bc31e53e1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 5220 bytes
font_01_sfnt_off0001059d.bin
ade60a38dff9c1e238c04a8aa2fc319ced5829623f22b44724c66d319cda8387		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 11100 bytes
font_02_sfnt_off00012a83.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A83 4324 bytes

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