Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbaac6ea2a8f154…

MALICIOUS

PDF

80.1 KB Created: 2021-04-02 23:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eba076f771c1a3d2abb6cc9fd1a2b900 SHA-1: 7713d755ae3d6694b972a49c75cb69ce62cda98d SHA-256: 9bbaac6ea2a8f154c08194e0f54c7b680e1cbeefba589b7e6b6a27766ae6584f
186 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 pointing to disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=basic+english+worksheets+year+7+pdf
    • https://jopazidavasuzu.weebly.com/uploads/1/3/2/6/132681438/2733874.pdf
    • http://lidedapomegila.iblogger.org/audition_vtc_o_nuoc_ngoai.pdf
    • http://wizomokupelew.iblogger.org/technics_sl_1210_mk2_new_price.pdf
    • http://ruszaimclub.ru/what_is_the_greek_god_of_dogso84kr.pdf
    • https://nurigefisigutip.weebly.com/uploads/1/3/4/6/134628418/0cd51f64.pdf
    • https://mawajajapok.weebly.com/uploads/1/3/4/3/134353668/5886a21b757f1.pdf
    • http://semowatuk.iblogger.org/1400927035.pdf
    • https://gafukarufigak.weebly.com/uploads/1/3/5/3/135309608/b4e96d708.pdf
    • http://supermagazforsale1.xyz/24704066008j1g0p.pdf
    • http://vazutokidoxe.iblogger.org/82347574099.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_001db6d0a4e844f6afb3d627afeea70e.pdf?index=true
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_4a5558d0e1c34298aedda89445e46a80.pdf?index=true
    • http://wuwomuwudawim.epizy.com/pes_football_game_for_mobile.pdf
    • http://xekuvazam.rf.gd/how_long_does_usps_forwarding_last.pdf
    • http://wubixulazig.rf.gd/does_dish_require_a_contract.pdf
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_d1556631ba034a878da10721857eb4bc.pdf?index=true
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_2bafd258ccea44f182b2042e8b78a1aa.pdf?index=true
    • https://63c031ef-a76e-4574-b6c7-b683c5cdde0f.filesusr.com/ugd/3a5e7a_7c6153b83d564e478c413bc28a04d973.pdf?index=true
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_c19aec6b91a94ab8ba0e1c62cd3bd6b3.pdf?index=true
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_e22167f8f5784a508be7fdd557b922ac.pdf?index=true
    • http://vagilamiporaw.epizy.com/ramasoki.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_off0000f9c0.bin
7c8e57dd8d24711baada4c340bf737e6236606c2fb79775c2458e03d151ca0fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 5804 bytes
font_01_sfnt_off00010d9d.bin
6245afbe52dd8ce462a85df7068fcdb175bfce2caa958c7f5d5522036045f93a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9D 10992 bytes

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