Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8df24977fc718e0…

MALICIOUS

PDF

75.6 KB Created: 2021-02-16 09:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2e98d3448dc4408ce6be7fa2b613ce50 SHA-1: 3eefd90af6d9e4fb1c7632411a1b3fe8f72d7d20 SHA-256: d8df24977fc718e09c68292d67e58514d741052da07b519ec79e7811fe9c25f1
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm, pointing to numerous distinct hosts, many of which are disposable. The embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics. No scripts were extracted, but the structure and URL findings strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wb?keyword=heart%20of%20darkness%20game%20pc PDF link annotation
    • https://cdn.sqhk.co/zuvezunotumu/cgcygcn/codecademy_python_tip_calculator_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/fexilejedit/bfv1Zjc/world_cup_1986_final_full_match.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456984/normal_6004a58fb0f6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5fdb08233c2e3.pdfIn PDF document text
    • https://dabamupusoga.weebly.com/uploads/1/3/4/2/134265366/8309213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_601847cd1edf0.pdfIn PDF document text
    • https://cdn.sqhk.co/kezavilageg/hjajjgd/gogunizadupogugelax.pdfIn PDF document text
    • https://wiwitubiz.weebly.com/uploads/1/3/5/3/135351816/4314506.pdfIn PDF document text
    • http://expo-kit.ru/98517518535dqaua.pdfIn PDF document text
    • http://visiblawty.com/como_superar_la_ansiedad_y_la_depresn1lsb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407304/normal_60263d4281b0e.pdfIn PDF document text
    • http://cardio-active.site/how_to_assemble_bowflex_xtreme_2_sek277l.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://s3.amazonaws.com/foneniz/nebenaxerivofaponebedipa.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/pezola.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/4441068761.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_off0000de04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE04 5208 bytes
SHA-256: 36165e422da7a84ec56a53494d891817685b3a8a91c31bced37778fd83202fac
font_01_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 10460 bytes
SHA-256: d863084a382508f09c12de2c0586c2a422059a93ba09719418d3c3a703398793
font_02_sfnt_off0001136b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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