Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4ec589c0e53e20…

MALICIOUS

PDF

93.7 KB Created: 2021-03-09 00:11:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d6a94e7313d0685dd2c98b4213af4679 SHA-1: a4b0eba5e1039cde24ffb6596ec4e6dd407ce6a5 SHA-256: cf4ec589c0e53e205d8a944c2c27f0288448742287748a1e9c02e9225a95804a
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive content.

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://midufefew.ru/award?keyword=blockchain+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/xokebuzizo/IOjcib2/vefifekezolizejor.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/hdiglhf/bomuwanorefagitetufidite.pdfIn PDF document text
    • https://gotivewa.weebly.com/uploads/1/3/1/0/131070711/f567422e38fcd1.pdfIn PDF document text
    • http://kudukudimox.sportsontheweb.net/nu7100_vs_ru7100.pdfIn PDF document text
    • http://vonoxafaku.scienceontheweb.net/achilles_tendinopathy.pdfIn PDF document text
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/5022a0.pdfIn PDF document text
    • http://majikok.mygamesonline.org/hunter_wireless_solar_sync_receiver.pdfIn PDF document text
    • http://gufutaca1.xyz/top_interior_design_game_apps8zmh2.pdfIn PDF document text
    • https://rurasaza.weebly.com/uploads/1/3/4/8/134869927/7406973.pdfIn PDF document text
    • https://cdn.sqhk.co/vitikitema/ceidEih/84787446546.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/dugolet.pdfIn PDF document text
    • https://cdn.sqhk.co/tozerutiwezu/eZuhL3o/78280362986.pdfIn PDF document text
    • http://scarcebook.com/dumb_ways_jr_zany_s_hospital_aptoided080m.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/76028831635.pdfIn PDF document text
    • https://monemoret.weebly.com/uploads/1/3/4/6/134667898/900545.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pibuluxe.rf.gd/85299323817.pdfIn PDF document text
    • http://daxevekiwenux.epizy.com/vuxukutitolitovab.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/miwuravemonojin.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/the_bloody_chamber_italiano.pdfIn PDF document text
    • http://fasevebozumip.rf.gd/negative_number_questions_worksheet.pdfIn PDF document text
    • http://pakatikik.epizy.com/bostitch_f28ww_trigger_valve_kit.pdfIn PDF document text
    • http://winibosekuzel.epizy.com/stihl_chainsaw_repair_manual_free_download.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_off0001348e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348E 5232 bytes
SHA-256: 28620507dc432aabef3f42c7e9625a92cdbe6779fbfe46c43065a3631d0ddb68
font_01_sfnt_off0001463e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463E 10408 bytes
SHA-256: 00299e1173f857670850803f3e880d6940207773156218ece643b68bad40094a

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