Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ccc9a539002bfa…

MALICIOUS

PDF

80.8 KB Created: 2021-04-03 07:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b72955a17594a77b96e79772d2a28921 SHA-1: 7e617a86242ced77f54ad51239ee437b26eacf26 SHA-256: e9ccc9a539002bfa04049ccedbaf5d673cbe837e3f00beb8dddcbb64e9104654
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=franny+and+zooey+book
    • https://gojufoviwovefu.weebly.com/uploads/1/3/4/5/134515133/2419358.pdf
    • http://tisimewifexumi.iblogger.org/33019225489.pdf
    • http://leririv.sportsontheweb.net/43721262023.pdf
    • http://ruwosiju.getenjoyment.net/poxivojovogugukevenopiz.pdf
    • http://lunatan.medianewsonline.com/how_a_bill_becomes_a_law_philippines.pdf
    • https://nesurufaratetud.weebly.com/uploads/1/3/1/4/131408203/dexidit.pdf
    • https://rakevuxex.weebly.com/uploads/1/3/4/0/134040666/c548a95.pdf
    • https://ragaxunuwad.weebly.com/uploads/1/3/1/4/131407405/fovewo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_b61a1ba8d3e8491abdbacddadeabfac2.pdf?index=true
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_c88a3952ce0d4619a13540b2fff13ad3.pdf?index=true
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_d109aec230824265b75b1d354f8de921.pdf?index=true
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_dbca414caf9346c7af52c5d148f25a8f.pdf?index=true
    • http://pejemevogoge.myartsonline.com/57491685726.pdf
    • https://uploads.strikinglycdn.com/files/aa3946fd-aa32-4b9a-ae64-5425125ac857/wildgame_innovations_terra_extreme_14mp_review.pdf
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_91df509bb1df447e86f3aa3d8768c6c0.pdf?index=true
    • https://2ae8fa2d-8b21-4cd7-bd94-b44763fb9b4d.filesusr.com/ugd/8e1ec7_a3e8d14c24ef40cc91d7c4fcfa83f66c.pdf?index=true
    • https://c0a42e0f-4cce-4e1b-84a6-2a5440198d67.filesusr.com/ugd/440b6d_d14f1d413751430d8c1c79b5cc1dd71c.pdf?index=true
    • http://pufupivati.epizy.com/55492651593.pdf
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_30f9147b8b184d51988c8b04cdbfdb27.pdf?index=true
    • http://giworutiw.myartsonline.com/sepujojewar.pdf
    • http://lagukanixawowe.epizy.com/54452336272.pdf
    • https://uploads.strikinglycdn.com/files/7a3ed75b-0748-45e9-a42f-cd8fb8be330e/firex_i4618_replace_battery.pdf
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_4d8aab49e9404e1f89d5107b24e8751e.pdf?index=true
    • 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_off0000fde2.bin
12ad017d6ef57ce4040e75ae17e00166f639c3c4cdedb2353201351310ec47a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 4920 bytes
font_01_sfnt_off00010ebe.bin
eca5f2fc3655ffcb7db5a73d4930fa90593b6b3e282bc5c0c55c417a185df810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBE 11472 bytes

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