Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b1c9832fbf09c8…

MALICIOUS

PDF

148.5 KB Created: 2021-04-10 02:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3382fc2ddf81134d8ae347432a614b6d SHA-1: 2752a787de8e1285bff9381171398f927976f2ee SHA-256: f8b1c9832fbf09c8bfd0582eacfe449ad150302890531fb58a3147a60e2b3c3e
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('jacksth.ru' and 'pedaxofanor.mywebcommunity.org') that are likely used to host phishing content or distribute further malware. The document body, though partially obfuscated, contains metadata suggesting it was generated by 'wkhtmltopdf', a tool sometimes used to create malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=origin+of+species+full+text+pdf PDF link annotation
    • http://pedaxofanor.mywebcommunity.org/xemukalimejofon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498834/normal_60047b9ad4a10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420586/normal_5fca97c62d5a2.pdfIn PDF document text
    • https://cdn.sqhk.co/farosexuto/hJWygtK/ffxiv_5._0_materia_guide.pdfIn PDF document text
    • http://zatawonilar.iblogger.org/tedopufitawojavavuze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444374/normal_5fdf147e2b3c1.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/uVggbJ6/music_maker_online_free_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/bipaneri/giFBjjH/59420646902.pdfIn PDF document text
    • https://cdn.sqhk.co/laxegipo/jibjfge/nfl_network_directv_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487905/normal_5fe7541354aee.pdfIn PDF document text
    • https://cdn.sqhk.co/vanatuwo/hfqgjif/xufalupo.pdfIn PDF document text
    • http://tusulanojob.22web.org/209641253.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/196bce09-df98-4985-9e65-9ecb220c513b/que_es_un_bosquejo_biblico_y_como_se_hace.pdfIn PDF document text
    • http://segoxegigo.epizy.com/79194799587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5fd4001-c23e-4e13-a572-c4f70b0e34d1/how_to_change_axis_of_rotation_in_autocad.pdfIn PDF document text
    • http://xuvuzonixo.onlinewebshop.net/12125073844.pdfIn PDF document text
    • http://fasasipapuzu.rf.gd/84614321376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db1ded86-e476-41fc-b6aa-c60fd41a5042/como_aliviar_el_dolor_del_brazo_despues_de_una_vacuna.pdfIn PDF document text
    • http://deketinak.rf.gd/jupinanivowulik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a53505d-d669-4e99-a561-cc1e3a50efce/70397966515.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F660 5208 bytes
SHA-256: 6e30aea1b6ebf26b47435364157a82e62c081cd505d5f948fdffa4e671e2ec59
font_01_sfnt_off00020837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20837 11612 bytes
SHA-256: 88b57b5930e23065c4ae06ee4717b779098b8e71835a1ed7b957c24579370830
font_02_sfnt_off00022ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22EE0 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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