Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f540f4ce4245f5…

MALICIOUS

PDF

76.9 KB Created: 2021-03-31 00:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3567eac4c04c5a2d8d979ee5d7754c23 SHA-1: 034223b65ea37bdb1ea9714f5491efd611a5da42 SHA-256: 79f540f4ce4245f54185d377f6b05b8de21dc6144637d4f98a9684cb48a60059
166 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifier indicated a high probability of maliciousness. The document body, though partially garbled, contains a title related to first aid kits, which is likely a lure. The presence of numerous external URIs, including one pointing to 'jacksth.ru/strik', suggests an attempt to redirect the user to a malicious site. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates a common tactic to bypass gateway scanning by instructing the user to open a password-protected archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jacksth.ru/strik?utm_term=que+tiene+q+tener+un+botiquin+de+primeros+auxilios PDF link annotation
    • http://freefire-gifts.com/connect_canon_printer_mg3520_to_wifi8wqwp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483602/normal_5fee9ad1a67f5.pdfIn PDF document text
    • http://xiviwuk.iblogger.org/cf_ph_manual_patch_1313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485001/normal_60379c41b6a5a.pdfIn PDF document text
    • http://josisenepezu.iblogger.org/46822618476.pdfIn PDF document text
    • http://kuziluzesoga.22web.org/55728991435.pdfIn PDF document text
    • http://xofelivigavas.mywebcommunity.org/65513439809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495985/normal_602b7935b0221.pdfIn PDF document text
    • http://adv-workshop.site/73309453089j5n76.pdfIn PDF document text
    • http://rozogididibusar.sportsontheweb.net/bluebeard_s_bride.pdfIn PDF document text
    • http://huseyincanx.com/35001750150hrnk6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://majoxokusixapav.epizy.com/waxerewakotove.pdfIn PDF document text
    • http://xurosuforudev.atwebpages.com/puguxivem.pdfIn PDF document text
    • http://rabelame.atwebpages.com/aneurisma_abdominal.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/jubuwufibes.pdfIn PDF document text
    • http://xibadon.rf.gd/tirubiremuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/sears_craftsman_radial_arm_saw_table_dimensions.pdfIn PDF document text
    • http://vubuzixefixa.onlinewebshop.net/calendario_2020_escolar_2020_comunidad_valenciana.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_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 5500 bytes
SHA-256: b81b575203eff9797a79b5c43f96f2d6ef00c9ebdd8cd6644df8786290a97452
font_01_sfnt_off0000fe14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE14 11964 bytes
SHA-256: 6bdb60d6c5fc219e486e7845738a69e307b090fda63bc8b23a9c75cbaef98e02

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