Malicious PDF — malware analysis report

Static analysis result for SHA-256 239f785840dc537f…

MALICIOUS

PDF

78.9 KB Created: 2021-05-01 00:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9f6f8b8ee4a2888d2ff3c5b432a21ca2 SHA-1: b2175db731dd096bcc28be3ba73b37a691ea2428 SHA-256: 239f785840dc537f6c050a028562ad6472ba50fdc08191ae6864ec4a58f6fc44
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://fokemale.ru/strik?utm_term=what+does+terminate+mean+in+math PDF link annotation
    • http://bawimip.sportsontheweb.net/xedozarikokajimuv.pdfIn PDF document text
    • https://cdn.sqhk.co/dowepigakaw/jcieLzm/photo_colour_change_app.pdfIn PDF document text
    • http://luchdobro.site/how_to_replace_a_two_prong_electrical_outlet3d85i.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/ogcid4Q/mother_care_baby_kit_price.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwasokeg/dVhfghi/32990432343.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/what_to_say_to_a_woman_diagnosed_with_breast_cancer.pdfIn PDF document text
    • http://getsalon.xyz/consultant_marketing_plan_templateac10f.pdfIn PDF document text
    • http://wusator.mygamesonline.org/cuisinart_coffee_maker_grinder_jammed.pdfIn PDF document text
    • http://durowan.sportsontheweb.net/ketogenic_diet_plan_free.pdfIn PDF document text
    • http://finofubamu.mygamesonline.org/87340545468.pdfIn PDF document text
    • http://tejowigasinafu.getenjoyment.net/barakamon_manga_download.pdfIn PDF document text
    • http://giwewigipebi.medianewsonline.com/dokoged.pdfIn PDF document text
    • http://vuzetasavuxoso.mygamesonline.org/96603542548.pdfIn PDF document text
    • http://medway24.com/jafokomagewivoo6d2q.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/savunowudob/gnOo533/smithfield_spiral_ham_near_me.pdfIn macro / runtime command snippet
    • http://vazewuxu.mywebcommunity.org/air_force_entrance_exam_paper.pdfIn macro / runtime command snippet
    • http://rimiripa.mypressonline.com/caliban_s_war_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sanegoz.epizy.com/islamic_bangla_book_download.pdfIn PDF document text
    • http://nununad.myartsonline.com/obstructive_sleep_apnea_patient_education.pdfIn PDF document text
    • http://dixasimoxipux.rf.gd/fattening_food_94_answers.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/56390924439.pdfIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/42007698971.pdfIn PDF document text
    • http://jesogini.rf.gd/cable_bicep_curl_proper_form.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_off0000f3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 5048 bytes
SHA-256: 55bf0810ca397ece158065526ed95c678ed1f512d086cb9fcd349c4c06d0b900
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 11552 bytes
SHA-256: 7cd28f497203a2569cd61b67779e94008c88e44bfc6d4850a8febce3f035195b

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