Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d21a3ff308be0b0…

MALICIOUS

PDF

77.8 KB Created: 2021-03-19 15:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4691f63f62de3d6d2fbe943f6188b09 SHA-1: 15e007aab6ee34dace75f996d6cf0772a62bbe62 SHA-256: 5d21a3ff308be0b096e4d798c4ad3eebf05dfe7807c8fca236fd054c2a990cf4
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, one of which, 'https://botokaw.ru/123?utm_term=arturia+analog+experience+the+laboratory+61+manual', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body, though heavily obfuscated, appears to contain metadata related to the lure and the PDF generation tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://botokaw.ru/123?utm_term=arturia+analog+experience+the+laboratory+61+manual
    • https://cdn.sqhk.co/wizokawoxo/fcvSchd/tugobigajafani.pdf
    • https://static.s123-cdn-static.com/uploads/4380869/normal_5ff9205d15db7.pdf
    • https://cdn.sqhk.co/mosepoxik/dPJhmtr/mortal_kombat_characters_female_90s.pdf
    • https://static.s123-cdn-static.com/uploads/4459926/normal_5fee07da315f8.pdf
    • https://cdn-cms.f-static.net/uploads/4453337/normal_5fdc5d159b2d7.pdf
    • https://cdn-cms.f-static.net/uploads/4371247/normal_6015a23349609.pdf
    • http://lodixol.22web.org/blackberry_desktop_software_for_windows_7.pdf
    • https://cdn.sqhk.co/vejuwipem/fGiimic/dimawaguretawesedapixuzi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/3d7718fd-0f98-4f4a-9963-7d51703fdf2e/73677693099.pdf
    • http://nuxizutize.rf.gd/rimop.pdf
    • http://fojiguxojed.epizy.com/balance_sheet_and_income_statement_sample.pdf
    • http://sarirepenibe.epizy.com/choir_music_sheet_holder.pdf
    • http://vodobugatusexa.epizy.com/dixigug.pdf
    • https://uploads.strikinglycdn.com/files/dd3fdf2c-a4a3-43b8-bf30-bc8f95d492d8/gisadaxizoperatig.pdf
    • http://sanaxumidi.epizy.com/how_to_get_secure_denture_adhesive_from_gums.pdf
    • https://uploads.strikinglycdn.com/files/7e9b701d-dd60-4b92-ada3-2bde2f7ed7e7/ejemplos_de_minutas.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_off0000e425.bin
d384e4cac5b250a1b4c8712582f05153a70c3206a3aaed9c087163fc5ddc8a9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 5556 bytes
font_01_sfnt_off0000f6ed.bin
f75d3e6abddc079fa2147a4dadbeccb87d821a93bc36ddfdf5bd5f5b20f84048		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 10820 bytes
font_02_sfnt_off00011bb4.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 4324 bytes

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