Malicious PDF — malware analysis report

Static analysis result for SHA-256 061a08b2ea66bb60…

MALICIOUS

PDF

77.2 KB Created: 2021-04-14 21:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3791e6b7832b24d755dff3228d792448 SHA-1: da18ce5a835c3169e543e0c58096fe93833f86cc SHA-256: 061a08b2ea66bb60ffa18a77a1e9519e274d03c2c9303987dc2f5cbd62f36bee
156 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 of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=juegos+verbos+irregulares+en+ingl%25C3%25A9s+para+ni%25C3%25B1os
    • https://wunurobi.weebly.com/uploads/1/3/4/8/134881210/lafiluvukupesamuxima.pdf
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/mivakitav_vuxegipumasi_rilajulusase_kenomutesa.pdf
    • https://maxojemuv.weebly.com/uploads/1/3/4/2/134266220/999671282.pdf
    • https://bemofoserobonuw.weebly.com/uploads/1/3/0/7/130739893/kuwebezebew.pdf
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/tuzuviradugagaje.pdf
    • https://mufaguzesevulet.weebly.com/uploads/1/3/2/8/132814956/c471e1.pdf
    • http://jigofajun.22web.org/balada_para_adelina_piano_partitura.pdf
    • https://zugixipenelir.weebly.com/uploads/1/3/4/5/134591811/pojomipove-sowut-rejagogorid.pdf
    • https://fubabogi.weebly.com/uploads/1/3/4/6/134617409/2f2267a0a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nefigubisi.epizy.com/gapajujilixuferi.pdf
    • http://ruwapebubori.epizy.com/tefel.pdf
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_0ae2c3562b674766850bf8de86cde629.pdf?index=true
    • https://uploads.strikinglycdn.com/files/09f02dd5-dbab-465c-b289-dbb9c255cf63/twilight_saga_new_moon_full_movie_free.pdf
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_ce930eb4be294a90977053e31dcd312d.pdf?index=true
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_42bf4afd691c42c6877f69e1b47a3600.pdf?index=true
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_b4e3531395de49bb8b2980a05d0fc62d.pdf?index=true
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_8209e3c9402e4a2dbc85bf3e750d8655.pdf?index=true
    • https://uploads.strikinglycdn.com/files/15e85bf0-0212-4358-9fd5-8a9a2ec61cf7/69220482596.pdf
    • https://uploads.strikinglycdn.com/files/d3f8e271-0721-467e-a508-9abe7f65b6c4/personal_development_planner_2021.pdf
    • https://uploads.strikinglycdn.com/files/560a70df-85a0-44b1-a279-e54d6f974932/tawopiwa.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_off0000eded.bin
45f887d824e0eaa7c6548f8a53055a7f2d23c3583ad36025f260d0b84dd65184		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 5532 bytes
font_01_sfnt_off00010048.bin
0a5082295c3b35dec3a5cc9ddd63f07575b8e0c2b7db4c0ae1ca923d825fb5b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 11352 bytes

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