Malicious PDF — malware analysis report

Static analysis result for SHA-256 36eef590661f8f63…

MALICIOUS

PDF

79.0 KB Created: 2021-03-24 16:30:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78513fb91d86b32adbfc3f28a293e7fe SHA-1: 50f52dec9907aec8cb9733f345a325c5dc246061 SHA-256: 36eef590661f8f631d43e3d951f79408639803bc1bef2a43335895a29e4d209f
136 Risk Score

Malware Insights

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

The PDF document contains a lure related to heating unit issues, directing users to external URLs. Heuristics indicate the presence of external URIs and a LOLBin sequence, suggesting an attempt to download or redirect the user. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://jacksth.ru/strik?utm_term=why+won%2527t+my+heating+unit+turn+off
    • https://static.s123-cdn-static.com/uploads/4412181/normal_6002bf64351e8.pdf
    • https://posuzelivoj.weebly.com/uploads/1/3/4/8/134869480/vomoteve.pdf
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/9727539.pdf
    • https://cdn-cms.f-static.net/uploads/4417659/normal_601389c255db9.pdf
    • https://cdn-cms.f-static.net/uploads/4459935/normal_604af53164884.pdf
    • https://static.s123-cdn-static.com/uploads/4383573/normal_5fe4b8151d1ae.pdf
    • http://tuzupibu.scienceontheweb.net/muziwudipojisewiloka.pdf
    • http://lejifip.sportsontheweb.net/barubazop.pdf
    • http://dakolozen.22web.org/1661862286.pdf
    • https://cdn-cms.f-static.net/uploads/4488103/normal_604cd3636f6fc.pdf
    • https://cdn-cms.f-static.net/uploads/4417141/normal_604de2e1c913a.pdf
    • https://cdn-cms.f-static.net/uploads/4457848/normal_602c18d6551c4.pdf
    • http://lejifip.sportsontheweb.net/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c42ba5fa-3065-4e02-a7ae-3555c14882ee/wirimekedoxuzat.pdf
    • http://molagegivijoxu.onlinewebshop.net/famelexoxubuvobovu.pdf
    • http://zitotinew.rf.gd/comma_usage_guide.pdf
    • http://jomopizemiz.onlinewebshop.net/pimefewodu.pdf
    • https://uploads.strikinglycdn.com/files/8133801f-5d33-4bb1-b9aa-f9f77006fe14/does_s_curl_damage_your_hair.pdf
    • https://uploads.strikinglycdn.com/files/ef9d453a-7551-485a-ac3e-ae73cbd05f27/kepewajakuxaduwe.pdf
    • https://uploads.strikinglycdn.com/files/9c5e5b4d-fa38-4456-a6c4-d781f64b407c/dadexirivipab.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_off0000f6c1.bin
6b4f69c7cbe85893db1e7a2264a1e39fb57d494586f45a8616600fd146977e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 5212 bytes
font_01_sfnt_off0001087a.bin
788a1fe539ba9556882cd78643ebdd6a277dac7bee94351cdd5dd999187e4d26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 11156 bytes

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