Malicious PDF — malware analysis report

Static analysis result for SHA-256 0221ee99191a9a98…

MALICIOUS

PDF

92.0 KB Created: 2021-03-15 21:55:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ae26730444d5aea2342d3d6ea09d0167 SHA-1: 4f07958eba2e2fe62e8a6639aba6dfb9b5325172 SHA-256: 0221ee99191a9a98f402748fe48c4239cdfb314163435f36ed637a1031f082b7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The primary malicious URL identified is https://mezovuduw.ru/strik, which is likely used to serve a malicious payload or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/strik?utm_term=how+to+use+gaggia+classic+coffee+machine PDF link annotation
    • https://cdn.sqhk.co/zapajugadira/hggggJx/73806397534.pdfIn PDF document text
    • https://cdn.sqhk.co/lazimafuxuxi/YhdjauV/bed_bath_and_beyond_wamsutta_sheets_725.pdfIn PDF document text
    • https://cdn.sqhk.co/mofekuma/jigqhdL/wibar.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/CKUjf71/vobaviteronez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_b1508903687b4e3bbac2f30be0d4c2d4.pdf?index=trueIn PDF document text
    • http://kogosez.epizy.com/96586719249.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_5640b08206c24a5eb279d3c12f4af647.pdf?index=trueIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_3b5af62ad6df40e781f0657d090b70d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d6936d-16fc-408e-bd41-106324eae7fc/36409942864.pdfIn PDF document text
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_82db798d5e574d47b0501a2e3485d171.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36b6892b-7522-45d6-b5a7-ac4b7f567e28/16739815896.pdfIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_acaaae36a1fd40c3b981c745b9b6b52b.pdf?index=trueIn PDF document text
    • http://todizegi.epizy.com/best_face_sheets_for_dry_skin.pdfIn PDF document text
    • http://gagimuludodu.epizy.com/batovipasujabisawobosu.pdfIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_4435dad572e74f9692731bbcb1803839.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 5136 bytes
SHA-256: 6e9361b7562a82eae1eba0daa269a197426735b23f50308b2791ecec3f56ec52
font_01_sfnt_off00012ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF9 11164 bytes
SHA-256: e0aae2caf33a921929d9d93783fca7cf0fcec7789e34f1eea4066720a60c35e2
font_02_sfnt_off00015514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15514 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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