Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cec75479ffedc2…

MALICIOUS

PDF

88.9 KB Created: 2021-03-19 19:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ab1b3bff67fff72bdc5d87430e292df8 SHA-1: 88fb80e9ce309f7a60786370dfb6f48443f4f9bc SHA-256: 91cec75479ffedc2408aeadc207eab4485b596071688c597c6b4a7a63cca4f93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=chhello+divas+movie+2015 PDF link annotation
    • http://palubofapejuraw.mywebcommunity.org/business_analytics_jobs_nyc.pdfIn PDF document text
    • http://bigwin-1xbet.fun/igneous_rocks_formation_worksheeth8dan.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/body_rider_elliptical_trainer_and_exercise_bike_with_seat_and_ea.pdfIn PDF document text
    • http://wozupabalaviv.medianewsonline.com/53436344267.pdfIn PDF document text
    • http://wegasanapifare.iblogger.org/xurami.pdfIn PDF document text
    • http://wiregabjuk.fun/country_living_room_decorating_ideas_ukqw9zv.pdfIn PDF document text
    • http://memiwuv.mygamesonline.org/34079491412.pdfIn PDF document text
    • http://ompala.store/898664564284wx8k.pdfIn PDF document text
    • http://1xbet-registr.site/2007500871c91fz.pdfIn PDF document text
    • http://kungfumalibu.com/ahmednagar_district_maphsj3o.pdfIn PDF document text
    • http://jawunefuda.mygamesonline.org/17833207886.pdfIn PDF document text
    • http://sokixatov.mywebcommunity.org/19931497185.pdfIn PDF document text
    • http://nokojatagi.mywebcommunity.org/36991045401.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/2caa0818-017e-4d8d-aa2a-d0802817da1e/zejadowa.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/lsat_bubble_sheet.pdfIn PDF document text
    • http://fukuselumetu.myartsonline.com/24433333025.pdfIn PDF document text
    • http://gemuviwir.rf.gd/noduvaxikinadazuvajutug.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/schumacher_battery_charger_manual_sc1308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1882eeaa-4be1-4116-8c8d-5764a24cd291/1088458966.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/how_to_reset_kenwood_protect_mode.pdfIn PDF document text
    • http://xovanixavujanu.epizy.com/algorithme_informatique_dfinition.pdfIn PDF document text
    • http://wudofowukad.rf.gd/50663616067.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 5384 bytes
SHA-256: d2527acbf9ffd1a23d9a5ab86b8ca4d9857c3022c7ff2bf68d0e3c4350884aa0
font_01_sfnt_off00010009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 8296 bytes
SHA-256: e2a196075db154cc23e605a3fa25ddb2eb6a01cb50fbee8d3e017312ab1a8020
font_02_sfnt_off00011ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 10944 bytes
SHA-256: 9d1bace06466cb00883cdcbc293d5c246ca132bccbd6867fb72f3dd6ab0167a8
font_03_sfnt_off00014055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14055 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3