Malicious PDF — malware analysis report

Static analysis result for SHA-256 d481af477c599efb…

MALICIOUS

PDF

99.3 KB Created: 2021-02-28 03:16:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9ab7e7766dfd2f4a6434d83e55bff07b SHA-1: cc4a6bd109a186ec79a61e93c9b9e40e32402412 SHA-256: d481af477c599efb8c8ed0afbc07e994e850af18ca28c549db62001b98c9c3a1
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to research topics, directing users to external URLs. The presence of embedded URLs and the link farm heuristic suggest an attempt to redirect users to malicious content.

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://lozipotod.ru/wb?keyword=what%20is%20cronbach PDF link annotation
    • http://gefosezidubajoz.scienceontheweb.net/49702543361.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460465/normal_5fc8fa2c12dfe.pdfIn PDF document text
    • http://damvglaz2.xyz/aix_en_provence_mapzpk55.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/coleman_mach_3_rv_air_conditioner_shroud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416921/normal_6026de5537247.pdfIn PDF document text
    • https://cdn.sqhk.co/gedodupem/gbWu9HL/carrom_board_game_rules_in_telugu_language.pdfIn PDF document text
    • http://teachersaid.fun/sccm_console_for_windows_10oo4n7.pdfIn PDF document text
    • http://vadosixajobirug.mygamesonline.org/alex_rider_scorpia_rising_english_creek.pdfIn PDF document text
    • http://easterthjg.com/dbt_training_2020_freei5bf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374368/normal_60299a2d81233.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500189/normal_60051491e79f6.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/69743110815.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogivuwe.onlinewebshop.net/pathfinder_reign_of_winter_traits.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/fujapemu.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/akinator_vip_apk_here.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14571 5484 bytes
SHA-256: 6d09f34d99624925cfb842d2efd32df618326b1a800e0735a3497167b17de780
font_01_sfnt_off00015801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15801 11688 bytes
SHA-256: 776b8c1e6877ebd051bc15ef41f2f2e9b3682369ec38e6fca634a9ac2d2fe16b

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