Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c643741e727c683…

MALICIOUS

PDF

68.5 KB Created: 2021-04-11 02:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b07cd7c3dba564a7021a6f95f0616aa4 SHA-1: 52fe8e7ca7a7d2234caf40332aec9f5956c95285 SHA-256: 6c643741e727c6835173bf833d8dc27081e32cf11cb8639ac8cae8d386072932
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to 'baarspo.ru', which is flagged as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, likely serves as a lure to encourage clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=rockstar+energy+drink+tropical+guava
    • https://static.s123-cdn-static.com/uploads/4382778/normal_5fccd59945f35.pdf
    • https://cdn.sqhk.co/bepifopid/hjdkhaX/kansas_city_airport_wiki.pdf
    • https://cdn-cms.f-static.net/uploads/4476443/normal_604305af78b61.pdf
    • https://cdn.sqhk.co/pajubopolak/dr7sErE/joverupiredajabuviges.pdf
    • http://teleporttur.ru/guidewire_technologies_incwi9we.pdf
    • http://mon-cmb.best/bdsmovement_significado_espaolwbw6i.pdf
    • https://cdn-cms.f-static.net/uploads/4415524/normal_60640639ceb86.pdf
    • http://purpless.vip/1987_ezgo_marathon_wiring_diagram5uxi4.pdf
    • https://cdn-cms.f-static.net/uploads/4450636/normal_603e4439b6cbb.pdf
    • https://cdn-cms.f-static.net/uploads/4425913/normal_6054905b4f306.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_71582b55b9644181ba5057bface0e7bf.pdf?index=true
    • http://xofinawudira.rf.gd/42001314035.pdf
    • https://4e16d9da-0927-4957-8a4e-4544605d6055.filesusr.com/ugd/d7e550_e1738f16e8404333859856758a95ba6b.pdf?index=true
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_a9eef4adb631493798bba333f8d13067.pdf?index=true
    • https://s3.amazonaws.com/zatasipezeg/kisoxutewatireme.pdf
    • http://mavujotok.epizy.com/22806605246.pdf
    • https://49d0234c-aae4-472d-9cb9-6192e9e03354.filesusr.com/ugd/a63595_03dc3ca51a1842b4bdb6b7273068c6fe.pdf?index=true
    • https://s3.amazonaws.com/sirilagewuga/what_is_the_main_branch_of_a_tree.pdf
    • http://gebukoxidu.rf.gd/ganapati_atharvashirsha_lyrics_marathi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb32.bin
99b8e681bc299da250d9c94346d65a22891ddc2b762d832f11d5579a5adc9df5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB32 5472 bytes
font_01_sfnt_off0000ddfb.bin
f7d643f91a1bec5473b054a17b8943f3cf31f7168edcb0f02acb52b653bb8324		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 11460 bytes

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