Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cd160d24550380…

MALICIOUS

PDF

73.3 KB Created: 2021-04-10 01:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bbc653899d05f9854c5aa920866a02a5 SHA-1: ce0c50be05dc8db719fdefb39eeb10b5a23870d8 SHA-256: 77cd160d24550380fec6002e5371802ff6e50a2993f1a7e78d7cc32b6d25e8b4
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary external URI pointing to 'https://resalured.ru/strik?utm_term=cast+tres+metros+sobre+el+cielo'. This URL, combined with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM', suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=cast+tres+metros+sobre+el+cielo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415051/normal_6063175d28190.pdfIn PDF document text
    • https://cdn.sqhk.co/burajugi/h7ijbge/jiparozukinugejisiz.pdfIn PDF document text
    • https://cdn.sqhk.co/pefatipi/gj32a4n/jotudasusipebawo.pdfIn PDF document text
    • http://momentshop.space/xidomimov06h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421641/normal_606837d93bb06.pdfIn PDF document text
    • https://cdn.sqhk.co/dulunukosep/jhijja0/87005286607.pdfIn PDF document text
    • http://pet-guru.shop/la_charca_restaurante_asturiano_madridv8fvc.pdfIn PDF document text
    • http://znakomstva18x.site/34624461484a3pzs.pdfIn PDF document text
    • http://topcreditcheck.info/nikon_coolpix_p520_camera_weightpk2aa.pdfIn PDF document text
    • http://4escam-bot.online/751683499604d2q8.pdfIn PDF document text
    • http://help-copyrightservice.xyz/kitchenaid_superba_oven_not_turning_ono3zvt.pdfIn PDF document text
    • http://agencymedia-ig.com/theseus_and_the_minotaur_story_in_hindihqi4u.pdfIn PDF document text
    • http://medicinfo.online/call_of_duty_black_ops_29vfzt.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwasazafu/iajgfib/flow_top_up_online_dominica.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465263/normal_5ff890a9cd768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/94028203437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83ebc990-0f06-4a1b-b003-79a67d7c118b/53499103623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cce8c3f-525d-4a8b-b113-bf1cb9eeb466/epson_wp_4530_ink_officeworks.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/free_math_coloring_sheets_for_1st_grade.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_off0000dda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 4992 bytes
SHA-256: e6dab5c42680a426c50ea1614c2e259716f1a0e673d26a3c4bc7f30789d0b5cc
font_01_sfnt_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 12176 bytes
SHA-256: 41247751d1cb0ca715df45fbee8edb33184c760f923191d6d99e8c848620e3d1

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