Malicious PDF — malware analysis report

Static analysis result for SHA-256 2813608e613c3e25…

MALICIOUS

PDF

82.0 KB Created: 2021-04-19 05:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 95e0dfa9792646838915aea520a7c127 SHA-1: 4fdde46f9bf34499d911865912df21536e849a29 SHA-256: 2813608e613c3e253fb8482b6097bc1f45b4c45ebb4eb1e20d5577c32029e408
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=scooter+maintenance+near+me PDF link annotation
    • http://liketime.fun/what_does_non_clinical_toxicology_meana3mjn.pdfIn PDF document text
    • http://tamawasobo.sportsontheweb.net/caracteristicas_fisicas_y_quimicas_de_la_atmosfera.pdfIn PDF document text
    • http://8gusevshop.space/how_to_draw_christmas_stuff_step_by_step_easyfp1h8.pdfIn PDF document text
    • http://bet-info.ru/storyboarder_for_ipadc845n.pdfIn PDF document text
    • https://dinumaditu.weebly.com/uploads/1/3/4/4/134479473/f441b6a8e6152.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/rotiwamoxerel.pdfIn PDF document text
    • http://praktika-ingenieur.com/11026744153dwswi.pdfIn PDF document text
    • http://reduslim-shopofficial.site/circulatory_system_worksheet_middle_schooly1emm.pdfIn PDF document text
    • http://levantemosaic.com/992886192102xte2.pdfIn PDF document text
    • https://temadugebunexi.weebly.com/uploads/1/3/1/8/131871621/5245849.pdfIn PDF document text
    • http://regse.website/77336716882hfnu5.pdfIn PDF document text
    • https://monezoxikaxusoj.weebly.com/uploads/1/3/1/4/131453753/5312828.pdfIn PDF document text
    • http://momentikshop.space/romantic_love_whatsapp_status_video_freen0ncj.pdfIn PDF document text
    • http://nevodoma.iblogger.org/anker_soundcore_motion_q_manual.pdfIn PDF document text
    • https://togezajotutev.weebly.com/uploads/1/3/0/8/130874352/gofidibinax-kaxesulinebe-dozole-zazoduwipu.pdfIn PDF document text
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/c1ae99.pdfIn PDF document text
    • http://nerroba.info/how_do_you_tell_the_age_of_a_beretta_shotgunk3aw2.pdfIn PDF document text
    • http://zomesotemaxage.66ghz.com/the_battle_cats.pdfIn PDF document text
    • http://jusapp.club/how_to_install_canon_printer_scanner_on_windows_10lgfyo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_466b5faf77fd490bb7648e8a3337b94a.pdf?index=trueIn PDF document text
    • http://wujagenak.atwebpages.com/dictionary_of_obscure_sorrows_download.pdfIn PDF document text
    • http://silapopo.epizy.com/weniru.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_fb575a99a79443c29661df3be65bb1e3.pdf?index=trueIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_17d1a447b10f4039a290b81305081c27.pdf?index=trueIn PDF document text
    • http://mosupemerumen.rf.gd/vidmate_whatsapp_status_video_hd.pdfIn PDF document text
    • http://jetotajasavesi.atwebpages.com/49239063997.pdfIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_7f53ab067ad14164a9b97e961f6e3d06.pdf?index=trueIn PDF document text
    • http://kedisijusa.onlinewebshop.net/feature_article_sample.pdfIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_1bed09dbc7a2401aae2ee27f185e060d.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001061d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 4840 bytes
SHA-256: a356d48b1dbf6a26a2c20c6a387ef7fc8808ad6b336f1eb48c4df0b71b8bd29e
font_01_sfnt_off00011677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 10496 bytes
SHA-256: 781d0db0eeade5d45cd827a1306f42fae6ddbe494441268110dc6a0366b5d5cc