Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0c37cb09cd61a1…

MALICIOUS

PDF

118.8 KB Created: 2021-04-24 15:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5fac89cd21b4fb5e9314055782ef4e1a SHA-1: 2f8a3ab085d2ad9e093ba774f423621b5ce79aae SHA-256: 4a0c37cb09cd61a144f5770ce4bfdc258c97719ea655b918c1bb8f654510f537
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm heuristic further supports this, as the document's primary function appears to be directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://baarspo.ru/strik?utm_term=2004+dodge+ram+1500+bed+for+sale PDF link annotation
    • http://wunuvuzixuxi.getenjoyment.net/encyclopedia_britannica_volume_1.pdfIn PDF document text
    • http://topvideo.design/clarice_lispector_agua_viva9efq4.pdfIn PDF document text
    • http://maska-respirator.shop/30082788872juc6z.pdfIn PDF document text
    • http://lazirog.mywebcommunity.org/what_causes_a_battery_light_to_come_on.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/g1iihae/monster_hunter_battle_royale.pdfIn PDF document text
    • http://yozi.store/hayward_swim_pro_voyager_installation1hhqn.pdfIn PDF document text
    • http://ayazshabutdinov.club/competency__career_development_plan_examples_for_software_engineern6hjd.pdfIn PDF document text
    • http://solapp.xyz/subunififulgz93.pdfIn PDF document text
    • http://lasleymarkt.ru/75357554216yepov.pdfIn PDF document text
    • http://pedrons.space/gafulokagujakisiruzozrfavj.pdfIn PDF document text
    • http://vugaganopofom.mypressonline.com/subigiwolif.pdfIn PDF document text
    • http://hydrofthol.space/font_poster_bodoni_btwh1nu.pdfIn PDF document text
    • http://tamawasobo.sportsontheweb.net/wofajotegafejov.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/iboDgiS/v40_thinq_screenshot.pdfIn PDF document text
    • http://adv-workshop.site/raksha_bandhan_song_video_2018c5flh.pdfIn PDF document text
    • http://jadebey-x.com/angular_6_format_currency_inputld3f2.pdfIn PDF document text
    • http://50offshop.pro/3d_maze_printable1brss.pdfIn PDF document text
    • https://cdn.sqhk.co/bepotedaxus/hbgjjfB/escape_game_50_rooms_1_level_50_explanation.pdfIn PDF document text
    • http://sethel.xyz/ferutimufadokafogavevine9mc.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/hkCidgV/72779863096.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_9dc21813d91c4c08b9ddc007aeec502d.pdf?index=trueIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_30137c8bea334040be74b2f96c2aca9a.pdf?index=trueIn 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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00018b51.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18B51 21612 bytes
SHA-256: 0cb3bdaa13080ad38aee85116ab0ab5b3b0b6a7ca9bf5be7fd5d4dadd3254c70
font_00_sfnt_off0001034a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 10716 bytes
SHA-256: 5012bb1d958f966cfb5c3dbec882881505d456354079f602d92871eaaa71428d
font_01_sfnt_off00012703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12703 5364 bytes
SHA-256: e43fa00ca1c0ec8e93f480233a19a60599b7d492bfc49240e9c5966896887b21
font_02_sfnt_off00013938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13938 7268 bytes
SHA-256: 9a8284caf805d1ef8685a58ae9ba306a2b86bdc9ab0af71bebc3138ccddcbec6
font_03_sfnt_off00014d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2C 21984 bytes
SHA-256: 058e98dd7565559a21b7417a1e78487222f42e81fd69b79c01fa5572b1f3ec39
font_05_sfnt_off0001b06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B06C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
font_06_sfnt_off0001be6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE6C 3452 bytes
SHA-256: 81c1592166b06510b50ff0fa597297dab6615489fa5be042b71402cd9fe9ae83