Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa17042f387affe9…

MALICIOUS

PDF

97.3 KB Created: 2021-03-29 09:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1f2eaf363a139e5551c9b74a923868f0 SHA-1: d53ecd36479aac51ffe560d121b32ce35cc0d761 SHA-256: aa17042f387affe98115733d5866607a2e46ba18b59a38f7f64dcea87e56eebb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct instructions or lures are discernible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=feminist+quotes+in+a+streetcar+named+desire PDF link annotation
    • http://instapresent.site/xobozekolavemizebpwfuh.pdfIn PDF document text
    • http://crystal-light33.ru/muwizxmdub.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/eNODqpo/minecraft_education_edition_mods.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/geWhajj/9636781442.pdfIn PDF document text
    • http://fabermanufacture.ru/ball_resurrection_apk_modx13vt.pdfIn PDF document text
    • http://academic-club.ru/tiwamusuvunodufegaskq6a9.pdfIn PDF document text
    • https://cdn.sqhk.co/supopelax/WOJjjxg/ralapereweraruwuxe.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/jcPjihe/free_music_ringtones_download_devotional.pdfIn PDF document text
    • http://daddytestit.xyz/ch4g2o2gco2g2h2og_type_of_reactionvg2y9.pdfIn PDF document text
    • http://damvglaz2.xyz/elena_and_damon_sleep_together_episodes2m5t.pdfIn PDF document text
    • http://winatesef.sportsontheweb.net/vodovodovifujuza.pdfIn PDF document text
    • http://discovljzg.fun/45996800039sqzv2.pdfIn PDF document text
    • http://peludofnor.fun/81114979587rqqwq.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopiroxab/hgR8ijD/project_management_meeting_agenda_template.pdfIn PDF document text
    • http://spindlndou.space/kinivo_btc450_bluetooth_hands-free_car_kitne8ap.pdfIn PDF document text
    • http://bagutoruramig.mywebcommunity.org/bellbirds_poem.pdfIn PDF document text
    • http://lovewaits.ru/xerox_workcentre_3325_toner_resetvozpr.pdfIn PDF document text
    • http://bunutib.mywebcommunity.org/kufesisuzo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gegetebipa.atwebpages.com/kandar_alangaram_lyrics_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e7886e4-8666-49af-9f23-ff5942895044/multimodal_deep_learning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e2d665-a0f8-4d64-ac5c-1a299cef43ae/the_gospel_of_judas_second_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87f897bc-3806-46cc-b5a1-39679085bc43/how_to_learn_cashier_work.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000145fb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x145FB 28012 bytes
SHA-256: aa0293588e941aa22e0c47a738b56001456b4bf856696ed96558a0289d1d990c
font_00_sfnt_off00010f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F81 5132 bytes
SHA-256: faebafc1ead5aa6122de6329f47c8b4a43a363e34a7612d373b42565e56ff0c9
font_01_sfnt_off000120dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 10820 bytes
SHA-256: 8b78c4c29b0ca5d97529aab747cb5bc99dae30faf58e9f42174de9d3021e620f

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