Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb28d7c763270f1a…

MALICIOUS

PDF

74.5 KB Created: 2021-03-15 16:56:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: efeec79d34be92e254e35bc72bb3b2ce SHA-1: 5c82d1731ce3121dba49109146f69fa3fe0a8888 SHA-256: eb28d7c763270f1a51bf82e8de9bdfab2af3fb7328e4f29e431134caee0a398e
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/123?utm_term=fishbone+chart+excel+template PDF link annotation
    • https://cdn.sqhk.co/dodiniwotud/bhcHwDn/subexiwi.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/cz7hhib/pets_runner_game_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/2gcgjmf/used_sofa_set_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/maweveju/ghgdGhe/falezifegimafos.pdfIn PDF document text
    • http://apsmall.space/android_studio_logo_fontlusb0.pdfIn PDF document text
    • http://003-center.ru/bostitch_vertical_battery_pencil_sharpener_manual47wgw.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/denon_avr-3313ci_service_manualj0e4q.pdfIn PDF document text
    • http://damita.fun/zulazujawapakb5onh.pdfIn PDF document text
    • http://businessoutsourcing.info/renaissance_periodization_free62ewr.pdfIn PDF document text
    • https://cdn.sqhk.co/patizuruf/jbjipjc/78932036133.pdfIn PDF document text
    • https://cdn.sqhk.co/nezupusovefi/e9gcovi/brooks_guide_rails_transcend_4.pdfIn PDF document text
    • https://cdn.sqhk.co/zidezofa/cihjiqu/buwinimizuxenodakifiwugu.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwasokeg/iaMjedN/microsoft_365_enterprise_administrator_expert_salary.pdfIn PDF document text
    • http://dlkmvkoenv.info/sifopiwibufapinungvezm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zulezov/dusizonifevodatop.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/articulate_storyline_360_game_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/50228312905.pdfIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_d1c88c5699e3428cb689ce07df17b41e.pdf?index=trueIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_ac08cc1411064b5ca39265a07c09fd91.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nisoxow/batch_programming_if_statement.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_off0000e647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 5336 bytes
SHA-256: bd11a000761198d2e2d799c444838047cf0f417932d706f4273b526c457a4abc
font_01_sfnt_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 10648 bytes
SHA-256: 4b85ec07a41e7466e8124af0ed8cb95056b345b4a03160b8a9341407a5965b48

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