Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2bc05f941a5780…

MALICIOUS

PDF

87.0 KB Created: 2021-09-24 08:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39a01a5fab13a0032f2d607349b38bd5 SHA-1: 8d6ed0ec92f788d83d89266d6f4393dd0b912183 SHA-256: 8f2bc05f941a57804b6428426d1fdd0a3d0c0bd25935ba75cf3e89a5c868d6cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high number of distinct hosts and links, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure points to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://zamaro.cz/images/fcke_files/file/pevubulobuzapa.pdf
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/4249988717.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130acd1e8058---61914123329.pdf
    • http://konberdbio.com/upload/files/sodavogewitimot.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/62b82c87b1b0360b0b0a43d5d8929849/61665903123.pdf
    • https://laughteronlineuniversity.com/images/upload/files/21905629880.pdf
    • https://gestionarival.com/userfiles/file/sutozijuzavi.pdf
    • https://purmoradiatoriai.lt/images/files/zenarexara.pdf
    • http://rana-international.com/userfiles/files/lijowegaxi.pdf
    • http://kondicionery-lobnya.ru/upload_picture/file/xikajirefatifumusul.pdf
    • http://devitohomesorlando.com/userfiles/files/tosuxikavavarufuvorula.pdf
    • http://whatcanidoforyou.eu/publish/file/65361017740.pdf
    • https://securitydm.rs/slicice/file/13626230403.pdf
    • https://yptea.com/data/fckeditor/files/zafotifevubed.pdf
    • http://zzzwchem.com/upload/files/13662287883.pdf
    • https://jhservice.net/imagenes/galeria/files/27491183016.pdf
    • http://tzsunup.com/upload/77802699348.pdf
    • https://telorgabus.com/contents/files/1879988982.pdf
    • http://sangjeom.com/userfiles/file///81656110517.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/8274121632.pdf
    • https://advantagelic.com/singhania/downloads/file/28227823161.pdf
    • http://americandeliorder.com/uploads/files/64143116211.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pes+2021+offline+android
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 16792 bytes
font_01_sfnt_off000108f4.bin
7f22bd68852ceb4c46fadaa8abc6d48da0c6efb7f59e580b7746a670b5411653		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 10544 bytes
font_02_sfnt_off00012127.bin
39a8c80afc832e9a93aea14d851ba1bd78adb38747b604ffd7ab55625507996d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12127 17340 bytes

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