Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d242a66083a7e6…

MALICIOUS

PDF

80.9 KB Created: 2021-03-23 17:45:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a56234703b788fcef317507da3e66422 SHA-1: d68fb4891757a4ce01c6af6cd4e10d09c56a2e1e SHA-256: f6d242a66083a7e6a2ae19e23c76f7abc799af466ae53c954c09deaad8058874
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The primary URL, 'https://mezovuduw.ru/award?keyword=all+information+about+gst+pdf', is presented as a lure for information about 'gst pdf'. ClamAV detected this as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as highly malicious. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/award?keyword=all+information+about+gst+pdf
    • https://cdn.sqhk.co/dakuwuwuzije/gBichjZ/baller_shot_caller.pdf
    • https://cdn.sqhk.co/rekubapapup/IWNzhha/84256563114.pdf
    • https://cdn.sqhk.co/zepipawetopi/ib7Bggi/gb_whatsapp_story_saver_apk_download.pdf
    • http://birodavaz.22web.org/flight_simulator_free_windows_7.pdf
    • https://cdn.sqhk.co/dofexoxev/OjchjKt/n64_emulator_games_coolrom.pdf
    • http://reduslim-italiaoficial.site/hallelujah_piano_sheet_musiclbck8.pdf
    • https://cdn.sqhk.co/fejisedetu/3Hsda4b/mudding_and_taping_drywall_patch.pdf
    • https://cdn.sqhk.co/bexamajuw/hjcg7ig/tmnt_legends_hack_mod_apk.pdf
    • http://nuxidokugaleme.iblogger.org/jimukibudalo.pdf
    • https://cdn.sqhk.co/zidulibu/ibdhiih/dungeon_keeper_4_gameplay.pdf
    • https://cdn.sqhk.co/sulugedako/ajPXNji/super_duper_slow_motion_lightning.pdf
    • https://cdn.sqhk.co/sowojusawepu/0ggjBYz/xagapuxoluwowufi.pdf
    • https://cdn.sqhk.co/raxasumo/QAgekha/bad_banks_netflix_cast.pdf
    • http://creditpm.com/jeguwanojobomaxefizp1fqo.pdf
    • https://cdn.sqhk.co/letopoto/ihc13gj/xalifusuxefiwutudu.pdf
    • https://cdn.sqhk.co/nuvurero/dSfhebv/xapemubomupugofe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pagiwufuvefukuf.epizy.com/diwufogozume.pdf
    • http://vibosaxijus.rf.gd/agentry_sap_mobile_platform.pdf
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_c857d0a47b96491984474db12aed9f84.pdf?index=true
    • http://nodikisiti.rf.gd/80400694116.pdf
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_6789ca2ddf8647928ba66a4f24b5092d.pdf?index=true
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_89c21b822aff47f68d4800d01464d242.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd65.bin
2ef4ba82d8130471b3af089090b5554c5a97b6794a437d103b58605561d52c96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD65 5492 bytes
font_01_sfnt_off00010ff3.bin
1735c857bcbc6e89a3a7d8767ab93cef24d37530f02061139e9c3bd693b629dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF3 10668 bytes

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