Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9cb0cc3b7b3aca…

MALICIOUS

PDF

85.5 KB Created: 2021-03-11 21:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35f15336b33095120058c907bf1edd9a SHA-1: 94a7d6b6d21876fb0f8795412fcaf028e120735a SHA-256: fb9cb0cc3b7b3acaa41cb0bc25be52a706aa6a305b8df88d074f72c6b89e4d7f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic firing for a PDF link farm. One of the primary external links, https://fokemale.ru/award?keyword=knee+joint+exercise+pdf, suggests a lure related to health or exercises. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fokemale.ru/award?keyword=knee+joint+exercise+pdf
    • https://rivepolimuf.weebly.com/uploads/1/3/0/8/130813401/milunimojipifadalir.pdf
    • https://xelixexojiga.weebly.com/uploads/1/3/4/1/134108676/vikokarijutipopag.pdf
    • https://gefatute.weebly.com/uploads/1/3/5/3/135345711/6454677.pdf
    • https://larezonisu.weebly.com/uploads/1/3/0/7/130738889/3f501bc1.pdf
    • https://madugonado.weebly.com/uploads/1/3/2/8/132815119/toxowenomad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b5122d1a-ac6c-4f44-9fce-97fedb4a84d2/mechanical_engineering_technologist_salary_ontario.pdf
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_6d77d33734ab4755bd03cd9e14651821.pdf?index=true
    • http://fomipituvopib.epizy.com/haier_hlp21n_water_inlet_hose.pdf
    • https://uploads.strikinglycdn.com/files/0a5fd5f9-7c32-4360-89aa-ae79b3069556/karomif.pdf
    • https://uploads.strikinglycdn.com/files/50403acf-e2a1-44a6-8d04-7fdb98805c54/86220104151.pdf
    • http://zakusomob.rf.gd/enterococcus_bacteremia_guidelines.pdf
    • https://uploads.strikinglycdn.com/files/9672a6fe-91ae-467c-86bc-f26b14f13d96/43287152746.pdf
    • https://uploads.strikinglycdn.com/files/672a5db7-85f9-459f-a07c-fc303aa43987/jekomoxezijogewetidajusa.pdf
    • https://uploads.strikinglycdn.com/files/15bd858f-b351-43f5-be12-6176165c71bb/93346860297.pdf
    • https://uploads.strikinglycdn.com/files/d1469256-8ab1-4567-bc4f-73cb5c6cd743/vowulajanewavo.pdf
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_ba4a95a3db3e4bec8b2b30446ec5629a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/18a37328-575c-410d-8256-b9d2ec3a542b/26999781386.pdf
    • https://uploads.strikinglycdn.com/files/255a5b20-f086-4681-97fe-750c9e9563de/is_the_book_in_a_dark_dark_wood_a_movie.pdf
    • http://zoxokukazo.epizy.com/sociology_anthony_giddens.pdf
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_c63700c6da4e4237a7eda989dde981e7.pdf?index=true
    • http://rusuxagek.rf.gd/62541616091.pdf
    • http://luxusuriva.epizy.com/bcg_ka_full_form_batao.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010626.bin
ddd044b94943e0af67f2a9ba9fec80f825b6610d93845c7be5721a419dfc019a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 4808 bytes
font_01_sfnt_off0001169a.bin
374d648a29a835b9705bbb2c8245774334fc222fe9fbc8e96e091297e2ad5664		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1169A 10472 bytes
font_02_sfnt_off00013a5e.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5E 4324 bytes

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