Malicious PDF — malware analysis report

Static analysis result for SHA-256 6073904f4fa27c1f…

MALICIOUS

PDF

84.7 KB Created: 2021-04-10 07:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ab4dcff214d4089c9d53622100eb82d3 SHA-1: 1e7c4b7285004e2c394b5038c7de57d0d91a4329 SHA-256: 6073904f4fa27c1ff7f52cc5963853557f170771de0121513a94598245793a08
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan distribution. The document body, though partially corrupted, suggests a lure related to a user manual, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=boss+dr.+rhythm+dr-3+user+manual PDF link annotation
    • http://mebelintera.ru/why_is_my_aux_heat_not_workingeop4d.pdfIn PDF document text
    • http://workbykoder.xyz/ellinika_biblia_downloadpblxi.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://topcabinets.xyz/verbos_irregulares_en_ingles_en_presente_pasado_y_participio_con_pronunciacionscu7o.pdfIn PDF document text
    • http://maleev.online/new_testament_bible_quiz26jqn.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://gratoramaa.space/whats_another_word_for_young_ageixxjs.pdfIn PDF document text
    • http://letxxnx.org/cooks_essentials_electric_pressure_cooker_directionsblov1.pdfIn PDF document text
    • http://amorexpo.com/boy_scout_manual_202073zs6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiwozoma.epizy.com/74925418754.pdfIn PDF document text
    • http://tijopuzotozume.rf.gd/50702828279.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/voyage_charter_party_standard_form.pdfIn PDF document text
    • http://nerivuvesu.epizy.com/how_to_oil_my_sligh_grandfather_clock.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/photo_background_frame_hd_free.pdfIn PDF document text
    • http://xadamodovupeniz.rf.gd/what_elements_does_potassium_bond_with.pdfIn PDF document text
    • http://nowaginog.epizy.com/55686940800.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/30868159544.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/icloud_unlocker_1._01_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/49615428545.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 5444 bytes
SHA-256: 382c062d8c9c7754b5ce0851e00301c9c1dee9c8f696244e7486c5afaacc3a07
font_01_sfnt_off00011f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F79 11176 bytes
SHA-256: 38ff20c6fa7abc2eebc1eaecf5b2ebc6040384aecc1500fc905626ea9fd0ee1b

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