Malicious PDF — malware analysis report

Static analysis result for SHA-256 231e47cbc4d88821…

MALICIOUS

PDF

82.1 KB Created: 2021-04-28 11:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 269f47ff81054da086f9e97721dd9ed7 SHA-1: b14c24033d312a9112f63e3abbc0594503d05155 SHA-256: 231e47cbc4d88821131fcf8b4d65a00419586066cfd90f6859f98418052444b5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded external links, with a critical heuristic indicating a 'PDF_SEO_LINK_FARM'. The primary malicious URL observed is https://dafemum.ru/strik. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the heuristics strongly suggest a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=what+does+a+negative+absorbance+value+mean
    • http://istlan.space/buwuvitesaxegezukijege2m74a.pdf
    • http://sexefowox.22web.org/76351352818.pdf
    • https://cdn-cms.f-static.net/uploads/4417403/normal_6040e98556146.pdf
    • https://static.s123-cdn-static.com/uploads/4495400/normal_5fec6e389e1ed.pdf
    • http://help-copyrightviolationhelpcenter.com/96192633691klcvn.pdf
    • http://italywom.space/2811227236mmsqt.pdf
    • http://vorecan.space/world_history_textbook_6th_grade_holtbnrtr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fuxurekosorozu.rf.gd/time_management_worksheet_a_weekly_tally.pdf
    • https://uploads.strikinglycdn.com/files/7f6d9bc0-2dd8-4e26-bb57-e85c8b625f80/power_wise_28115_g04_not_working.pdf
    • https://uploads.strikinglycdn.com/files/d8395c14-a0a8-4438-b6c2-8e898b29878e/how_to_put_text_in_adobe_premiere_pro_2020.pdf
    • https://uploads.strikinglycdn.com/files/aec25032-d07a-4e55-9ef4-7d1090172d6d/wndr3700_router_ip_address.pdf
    • https://uploads.strikinglycdn.com/files/4457e903-253c-4365-8d26-6b9053ebdcc2/animal_farm_george_orwell_audiobook_chapter_1.pdf
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_abb91060141b437f86d77e965ae84743.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9f8d2eea-00a6-4516-86b2-1fb633051688/65430321635.pdf
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_46c10a84310c4e859bab11e45d2ee2cc.pdf?index=true
    • http://fedatowuka.epizy.com/xejakati.pdf
    • http://duvufewitopemaw.rf.gd/zivufofuza.pdf
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_ea6e4a5b20fb4b008a1c9111c156ffa1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7ded1bc8-9072-44a5-adbe-05c9639f6b72/how_to_eat_low_carb_and_gluten_free.pdf
    • https://uploads.strikinglycdn.com/files/1a4bb018-a82a-4590-9097-4dedf0fbab87/1698003065.pdf
    • https://uploads.strikinglycdn.com/files/5b6cdca9-7906-4178-b626-88b366808b6c/99_names_of_allah_with_benefits_in_english.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99f.bin
a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 2900 bytes
font_01_sfnt_off0000f3e1.bin
99365335906a9b7b09cead4776538fffa6512735829efeb2f7ad14845c224b01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 5448 bytes
font_02_sfnt_off0001064a.bin
a9b23b8cc1f05c437905f6d20782bcccef32f8ec9889e269bdabf01d60518bac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 11180 bytes
font_03_sfnt_off00012c51.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C51 4324 bytes

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