Malicious PDF — malware analysis report

Static analysis result for SHA-256 3246bb7370a27d6d…

MALICIOUS

PDF

71.7 KB Created: 2021-01-31 17:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7b3e6edd50fefd47224e4370cc762909 SHA-1: 1fad75621517e87373fecc8094a028b1fc33882e SHA-256: 3246bb7370a27d6d28c1516ba2aaccbeef17305cd6461a4e1dca58c84ae533d7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the 'link farm' heuristic strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=she+fought+alone+soundtrack PDF link annotation
    • http://fitness-ital.fun/seven_little_words_bonus_answers_todayicxyc.pdfIn PDF document text
    • http://domastmsk.space/diy_table_top_balloon_archnjyv8.pdfIn PDF document text
    • http://shtangye.xyz/boom_beach_base_building_tipselo6r.pdfIn PDF document text
    • http://dirujadejefogax.iblogger.org/offline_spreadsheet_app_for_iphone.pdfIn PDF document text
    • https://saxotatabaf.weebly.com/uploads/1/3/4/3/134328870/zeduvopefag.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/pijorixamojaxo-ledigetujopix-paxogumew.pdfIn PDF document text
    • http://vivofuma.66ghz.com/85928784579.pdfIn PDF document text
    • http://trend-sales.fun/kenutesijavazukdaf76.pdfIn PDF document text
    • https://naxozafo.weebly.com/uploads/1/3/1/4/131483391/gudegimitapo-bogugu-vikamo-melefefuwu.pdfIn PDF document text
    • http://fitness-ital.fun/bil_batori_meaning_in_englishf4w2c.pdfIn PDF document text
    • http://kinoxca.xyz/34191582708o29v.pdfIn PDF document text
    • http://slimerecipe.org/640817949313dekl.pdfIn PDF document text
    • http://opticsystem.website/legendary_warriors_game2r21f.pdfIn PDF document text
    • http://classkaod.ru/66330182678cls1m.pdfIn PDF document text
    • https://dolepaxutafajur.weebly.com/uploads/1/3/0/9/130969408/b747ff12.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/bufipevuril/69942226155.pdfIn PDF document text
    • http://jorunodup.rf.gd/reporting_unethical_behaviour_in_the_workplace.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/81487304635.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/audiomack_new_music_4._1._5.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/zutofabisekowirit.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/brad_mehldau_paranoid_android_sheet_music.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_off0000dae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE1 5452 bytes
SHA-256: 5f5a5761694fa16124d7f19a9b913819354f27087d3414dfd7ecd516f7e4356d
font_01_sfnt_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 10608 bytes
SHA-256: 4ef829e4f22fd6e87d034445e57988999fe84e6c7d36f717510d2ecd13ff2da7

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