Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b424eeed5070baf…

MALICIOUS

PDF

72.3 KB Created: 2021-02-28 02:43:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4f2a8f654c1ad3d94f82494705ae40f8 SHA-1: 2cf80f263b6329a6b9f5e70430c569733af8650c SHA-256: 7b424eeed5070baf434be75e6bba71453e66d3c25fe1c98a21800a1661a548b6
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting services, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to technical queries, likely to encourage clicks on the malicious links.

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://mezovuduw.ru/strik?utm_term=what+size+blade+for+craftsman+12+bandsaw PDF link annotation
    • https://metiledozixav.weebly.com/uploads/1/3/1/1/131164016/6174444.pdfIn PDF document text
    • https://wijodemarivupi.weebly.com/uploads/1/3/4/8/134861972/3703985.pdfIn PDF document text
    • https://fodubimofo.weebly.com/uploads/1/3/4/8/134884763/8787621.pdfIn PDF document text
    • http://nat-yoga.space/best_free_photo_collage_maker_for_pclprb2.pdfIn PDF document text
    • http://lesantyqas.online/what_is_development_class_10thj9sbz.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/vumosuduresoxojog.pdfIn PDF document text
    • http://samo-katim.ru/82114870282t5esv.pdfIn PDF document text
    • http://hh666o.site/out_of_the_loop_rooster_teeth9irk5.pdfIn PDF document text
    • http://digtalcaliper09.xyz/51778788469bzgty.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/bupesejirijejus/annual_emergency_light_test_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/sosotifurija.pdfIn PDF document text
    • http://vuvuvemalazot.epizy.com/56933125318.pdfIn PDF document text
    • http://vemireme.epizy.com/goritovesi.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/webasto_diesel_heater_white_smoke.pdfIn PDF document text
    • http://dujisuga.epizy.com/nideg.pdfIn PDF document text
    • http://seladetitogar.epizy.com/46895506240.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_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 5740 bytes
SHA-256: 58e11b7e47f60e6b644eba157eb829cbc740865e640dd7f1e1910b9689c1617f
font_01_sfnt_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 10372 bytes
SHA-256: 0e3c335d1b8a44183740d2de615982c68f806e1ffd01c13d0a22e4db1c3b1e34

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