Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eefb2dc301978d6…

MALICIOUS

PDF

77.0 KB Created: 2021-05-02 07:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75ed3aed9e875b53c67f2815e78ec7c9 SHA-1: 5b526872eff267968ac2645326144881c4df2c69 SHA-256: 9eefb2dc301978d64672801e0ce86dc00f98ef77459234a037ed5c4597d7c714
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier indicating a high probability of maliciousness. The PDF contains a large number of external links, suggesting it is part of a link farm or SEO manipulation scheme, with a primary malicious URL identified as https://nipisod.ru/strik. The presence of embedded URLs and the overall structure strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=arabesque+hazo+score+pdf
    • http://farozemirig.scienceontheweb.net/79768521679.pdf
    • https://zabidikigez.weebly.com/uploads/1/3/4/5/134594795/9233717.pdf
    • https://cdn-cms.f-static.net/uploads/4368978/normal_6031261118a8e.pdf
    • https://static.s123-cdn-static.com/uploads/4412159/normal_5ffd673f31960.pdf
    • https://cdn-cms.f-static.net/uploads/4369307/normal_6023f1b37148b.pdf
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/507d570b.pdf
    • http://lukufogud.getenjoyment.net/ninabuvufezolujudekuzodos.pdf
    • https://nekonidi.weebly.com/uploads/1/3/0/9/130969497/5178171.pdf
    • https://cdn-cms.f-static.net/uploads/4481424/normal_6046db25c8389.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5c30759d-ec65-4223-b411-4fdfd5438908/why_did_montresor_kill_fortunato.pdf
    • http://gapevizatijaba.epizy.com/autolisp_programs_for_autocad.pdf
    • https://uploads.strikinglycdn.com/files/94310728-f4b1-4318-a0ad-d24c091d8633/chegg_physical_chemistry_for_the_life_sciences_solutions.pdf
    • https://uploads.strikinglycdn.com/files/aaf1a8d8-e777-40a7-a65c-0590e7b6623c/8634605690.pdf
    • http://besuvom.rf.gd/88750971131.pdf
    • https://uploads.strikinglycdn.com/files/59aec27d-d8b7-41ec-8164-25dde12402b6/85225728434.pdf
    • https://uploads.strikinglycdn.com/files/0c5ad011-7685-4bbb-b20f-e1eb50f00abd/how_to_write_a_plot_outline_for_a_novel.pdf
    • http://vipuzala.myartsonline.com/zegoxolidukubuxuvosuju.pdf
    • http://pekomuvave.myartsonline.com/xitulapedapimavap.pdf
    • https://uploads.strikinglycdn.com/files/11ea6ae1-125a-43ef-82a0-c52d2925071e/char_broil_smoker_recipes_pork_loin.pdf
    • https://uploads.strikinglycdn.com/files/d16f1ccb-81a9-44c7-94a6-b7592bd3617f/toto_toilet_handle_replacement_9592.pdf
    • http://bixivanudupona.epizy.com/36853079890.pdf
    • https://uploads.strikinglycdn.com/files/4ddbcdb6-4f89-4183-a10f-65e8eaea4840/char_broil_oil_less_fryer_chicken_cooking_times.pdf
    • https://uploads.strikinglycdn.com/files/4acf3598-aea1-47ff-9e66-bd4708124366/13445435046.pdf
    • https://uploads.strikinglycdn.com/files/36c86102-1d1e-4dae-82bc-75da90e291a2/kawasaki_prairie_400_rear_differential_oil.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_off0000edf9.bin
f1dc59d9b9bf12d1798d5317329bad8d42bea3a0770fc96a11f2bdbae071d833		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 5516 bytes
font_01_sfnt_off000100b9.bin
e486954e91c6396873f20d715646225dbbceb7d7129a598b1a8aeca7eda29e59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 11232 bytes

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