Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a05f63af54e329…

MALICIOUS

PDF

86.4 KB Created: 2021-05-01 03:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8aa750566bb7d8910e8bdc054caf0920 SHA-1: f8b9068af4b944d0b5a7c9ca987ac543657d07b5 SHA-256: f4a05f63af54e32922a808f5b193a0c3ae9e1020120952976728cd1cd17e6c0d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains, a common tactic for SEO spam or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://seumenha.ru/strik?utm_term=poetry+forms+to+try PDF link annotation
    • https://cdn.sqhk.co/tezofugowura/rjbWrnl/super_snake_2019_mustang_cobra.pdfIn PDF document text
    • http://future-techno.ru/is_hiit_strength_training_or_cardio3h3ni.pdfIn PDF document text
    • http://phtech.site/genie_model_7055_door_wont_openwk6ba.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/ajiRjbJ/pinout_game_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_605dc4be21fb8.pdfIn PDF document text
    • https://cdn.sqhk.co/fetuxudo/Q0icCha/pottery_barn_crib_sheets_on_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/lizuxutagisu/Cjetkig/remix_songs_2019_mp3_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480423/normal_603a250982922.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/TQV5Ogu/amy_nails_salons_open_today.pdfIn PDF document text
    • http://ziviludemedo.iblogger.org/datinabazak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/40ad7425-09dd-4905-958d-c784e5f49710/what_story_is_the_lion_king_based_on.pdfIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_74182dee46a94366a16307c18c89e6d4.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_5a2e8393f1ab450d95122d105b0461c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/498210e0-5bc7-4e5a-a898-bec9f1bd0fc4/kawawiminewazarik.pdfIn PDF document text
    • http://sezaluri.rf.gd/function_of_liver_in_digestive_system.pdfIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_4cc1ce765c14424db26025cb1203abcd.pdf?index=trueIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_cb6ac16da52141c9b8f3bccbd7cc187a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05192c1e-50a7-4ed7-af09-b29157d721d8/geronimo_stilton_book_2.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F9 4408 bytes
SHA-256: 4447d1732262aee185dc6561012a41503f362b01ed83165baecf6a48b50a5cec
font_01_sfnt_off000118ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EF 10528 bytes
SHA-256: e47d17e9e704008a954d652fa780153e6072c2d7a576699e76deb81f1b24eaa9
font_02_sfnt_off00013cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEE 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176