Malicious PDF — malware analysis report

Static analysis result for SHA-256 d334ff6a43d0232c…

MALICIOUS

PDF

80.6 KB Created: 2021-03-11 01:46:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a5faf549fd5f6cbea9ca22daaaec2278 SHA-1: e81a908e49a15d8e4751a614d5b1e92c69167941 SHA-256: d334ff6a43d0232cc5bb67f274a8d85bee5695085f32db74fd94399c3b90c61b
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as 'https://vilenefex.ru/award?keyword=acute+appendicitis+in+pregnancy+pdf', strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/award?keyword=acute+appendicitis+in+pregnancy+pdf PDF link annotation
    • http://national-verifyteam.com/how_to_change_battery_in_relion_temple_thermometer4lryz.pdfIn PDF document text
    • http://creampiepow.club/api_testing_and_web_services_testing_are_sameufjze.pdfIn PDF document text
    • http://dokelamalide.iblogger.org/69169681591.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/fibjggj/bubble_maniac_tea_house_providence.pdfIn PDF document text
    • http://steblin.pro/good_transition_words_to_start_a_conclusionwwkv9.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/idfXdhg/59374855379.pdfIn PDF document text
    • http://verification-help.business/geronimo_stilton_latest_book_2018gwfh2.pdfIn PDF document text
    • https://cdn.sqhk.co/wamiratena/Wjecgdp/51005937387.pdfIn PDF document text
    • http://oyuncuxx.com/82701154233cbgcb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_e777876853f5473fab95a4eda4108111.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c266cb-9b3f-46bc-ac10-4a2a0ed859a8/wing_chun_private_lessons_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc28ee4f-d885-4bee-bea6-794550f30bb9/how_to_approach_conflict_resolution_in_a_relationship.pdfIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_6a091704d4b445e1bf11090f5b763298.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce7722b5-fab2-4411-b18c-3cb6e275bae8/84722348960.pdfIn PDF document text
    • http://zagopemolal.rf.gd/fawisofapuxozudupuwi.pdfIn PDF document text
    • http://dogiperij.epizy.com/felodikam.pdfIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_41128fec0ae6411dbfeac42adf3a10b7.pdf?index=trueIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_e9b154c00c724cfe996d0a71f824936e.pdf?index=trueIn PDF document text
    • http://lememisuxelivem.rf.gd/business_management_subjects.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce8ef57-4334-4393-8bf4-7c2a9b2a77ed/what_does_annabel_lee_poem_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a238c09a-adf3-45a4-9b23-38fd15c64ed6/minn_kota_ulterra_80_us2-60_w_i-pilot.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 5152 bytes
SHA-256: cf429f2174ea2fdad22e263b9e634cb3a5d333b7318b37795569f76097a6898f
font_01_sfnt_off0001041a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041A 10284 bytes
SHA-256: bd07a6cb7e45aa283d0ac8d433462e818b47d4d20657bac65bd7f2655dca65cf
font_02_sfnt_off00012706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12706 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378