Malicious PDF — malware analysis report

Static analysis result for SHA-256 d624ca2902d61e23…

MALICIOUS

PDF

128.5 KB Created: 2021-03-27 20:07:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 800d4f04467296bdfb2f2a48e17d4cc2 SHA-1: 1677a7f5f285a0045215060e4ec5cd78b3c414dd SHA-256: d624ca2902d61e231578dee6194990890bd9e8b9942a0f6e727157594803fe8b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains embedded URLs pointing to suspicious domains, including one that appears to be a link farm. The document body, though heavily obfuscated, contains keywords related to 'firmware update' and application names, suggesting a social engineering lure. The presence of external URIs and the nature of the heuristics strongly indicate an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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/wb?keyword=avantree%20audition%20pro%20firmware%20update
    • http://xomunuxeju.sportsontheweb.net/kubuvosegeraponejitutopuw.pdf
    • http://gemotebefid.22web.org/operating_system_concepts_8th_edition_solutions_to_exercises.pdf
    • http://jofufuzutaki.22web.org/83328460336.pdf
    • http://kotudekudoges.getenjoyment.net/mumovanime.pdf
    • https://timijajuvage.weebly.com/uploads/1/3/2/6/132683040/419793.pdf
    • http://manibupefif.mypressonline.com/37976242594.pdf
    • http://lobafor.mypressonline.com/bossa_nova_piano_sheet_music.pdf
    • http://larediwavokib.iblogger.org/nezikogavux.pdf
    • http://watogoda.mypressonline.com/colpitts_oscillator_download.pdf
    • https://dodizavezoku.weebly.com/uploads/1/3/1/3/131398251/sinifewizifuwuzavoda.pdf
    • http://mimisijuz.mypressonline.com/15518209687.pdf
    • https://sojutobifedurex.weebly.com/uploads/1/3/4/5/134588439/josotisugukakoj_nisol_xikeduvex.pdf
    • http://wifunagidoli.mypressonline.com/30643200683.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://favekagopu.epizy.com/calculate_aspect_ratio_of_image_android.pdf
    • http://vuwilup.epizy.com/82008928481.pdf
    • http://zemufobure.rf.gd/how_to_do_100_pushups_a_day_reddit.pdf
    • http://mevezexagugon.rf.gd/gojuwilekiduridofitinen.pdf
    • http://kokiralasido.epizy.com/41325343548.pdf
    • http://weguxuwe.epizy.com/what_are_the_types_of_relation_in_function.pdf
    • http://gizogebinide.rf.gd/96993208119.pdf
    • http://janofegiwene.epizy.com/aluminium_sheet_sizes.pdf
    • http://bituwevemexeku.rf.gd/ashton_kutcher_brother_michael.pdf
    • http://diverozisutujew.epizy.com/78961833944.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ae58.bin
4c688c0676da4c9c3f1d636d29496b85ed1f90b4285ee9b780884cc7de0e34ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE58 2960 bytes
font_01_sfnt_off0001b8c8.bin
311e3e6fa82e3031d123a6ec8e398565b3f597276b55231f7dc1b8706043f4ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8C8 5120 bytes
font_02_sfnt_off0001ca38.bin
c7fd73fb5b8b090397735cd908d2e6414575c3ee400bb56313758175cf6de1de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA38 12004 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.