Malicious PDF — malware analysis report

Static analysis result for SHA-256 d771163d755af3b9…

MALICIOUS

PDF

91.1 KB Created: 2021-03-17 23:13:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 41c8e24877c1e35b7e63dfe72933c37c SHA-1: cfcac475078bb00d9e7c1e4f89d347a80c39809b SHA-256: d771163d755af3b9515b6cea75cc27302d703e80c6ee8c6f2bfd4006ef6fc1fe
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('gimoguvi.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious intent to redirect users through multiple disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://gimoguvi.ru/award?keyword=american+college+of+cardiology+guidelines+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371498/normal_5ff5c422e2463.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375209/normal_5fdd336d78b34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410432/normal_6012b73290e3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527042/normal_6050676039eb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415518/normal_6036d7a8dc183.pdfIn PDF document text
    • http://mowogaw.mypressonline.com/limejuderitivojomet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488569/normal_5fd2aee05ffe2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470696/normal_5fe554d038813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501045/normal_6039ea8f01db4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417405/normal_60510ab35bcef.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/how_to_connect_brother_mfc-l2740dw_printer_to_wifi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://godavuvexo.epizy.com/how_to_workout_for_mass_and_strength.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/amazing_engine_rpg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba3b33a9-e75d-4226-ae08-fed372808948/how_to_say_lenin_in_russian.pdfIn PDF document text
    • http://togoraxig.rf.gd/invicta_watches_for_sale_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/criminal_law_book_1_and_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f47141fa-b045-4292-8bf6-dfa73ce1f042/how_to_ignite_gas_water_heater_rheem.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/fillable_biodata_form_philippines.pdfIn PDF document text
    • http://ruvedinaz.rf.gd/80008671494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b403537-b17a-4423-a16d-c1d5e24d27c6/what_is_stomach_in_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/18834013406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22efd576-295b-41ea-83f0-d0d7f1df3e15/can_you_use_a_family_members_planet_fitness_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37fead19-5fa7-4a91-a9e6-152c78fa77c8/86371327882.pdfIn PDF document text
    • http://vokesakogo.onlinewebshop.net/lamepadezavanasodapox.pdfIn PDF document text
    • http://ziwilud.epizy.com/41803080357.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/aircrack-_ng_termux.pdfIn PDF document text
    • http://tigagatu.atwebpages.com/annabac_physique.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_off000124ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CA 5564 bytes
SHA-256: 55069e957870d520e6ed1398e117a5a4f18e45bb9d57d19603ab331a66ace765
font_01_sfnt_off000137ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AD 11436 bytes
SHA-256: 25fc54c7a4104e1c101395fc5bc8e260ac5d5fe480f6848c1f0a958c0c2250dc