Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c478723afad97e…

MALICIOUS

PDF

81.4 KB Created: 2021-05-16 15:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e6fad009ca2cfc31ab9698aa77e39e6a SHA-1: 7154fa74c5d3782fb4d10a45739df7be743e27a1 SHA-256: 88c478723afad97e770bbf899cc8dc960976563013618c04bb5fff2ef01eb9c9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to host malicious content or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=interview+questions+to+ask+sales+manager+candidates PDF link annotation
    • https://pagapepekajarop.weebly.com/uploads/1/3/4/3/134307963/releputo.pdfIn PDF document text
    • https://cdn.sqhk.co/pulafefer/gfelKid/software_estimation_spreadsheet.pdfIn PDF document text
    • https://fexogobavube.weebly.com/uploads/1/3/4/6/134639764/kiwunofijabowitozi.pdfIn PDF document text
    • https://cdn.sqhk.co/rijizedot/QshekrK/70259105502.pdfIn PDF document text
    • https://cdn.sqhk.co/surixirulol/MgfDsN3/castle_building_tutorial_minecraft.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/18454e8877.pdfIn PDF document text
    • https://seritixatot.weebly.com/uploads/1/3/1/0/131070849/83f9719dbb3.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwewiwudesi/VBje2hi/xerusalamuvorabawetovap.pdfIn PDF document text
    • https://cdn.sqhk.co/mukujoripu/gdWwEhc/flashlight_song_lyrics_espanol.pdfIn PDF document text
    • https://birinubawode.weebly.com/uploads/1/3/6/0/136026057/bijorupefeteliz.pdfIn PDF document text
    • https://bitipobigexu.weebly.com/uploads/1/3/5/3/135399459/5719ecab246e.pdfIn PDF document text
    • https://cdn.sqhk.co/vojasipi/jdhhYsA/70989200428.pdfIn PDF document text
    • https://rusekawavupor.weebly.com/uploads/1/3/4/0/134096427/2273596.pdfIn PDF document text
    • https://luvatuxi.weebly.com/uploads/1/3/4/3/134321506/tobemorat-tafulafobakagow-rujixa.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/ggeibUE/anime_wallpapers_iphone_4k.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/7645382.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/jYhficc/clock_spider_urban_dictionary.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/gezetega/about_me_template_for_work.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/psat_practice_test_spring_2018_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/10_point_review_of_systems_template.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/32394803605.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/52324601874.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_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 5540 bytes
SHA-256: 684d26bad983b23040a7e75ec7ddff22e8ab5b6b53d855a8cb8857eab5545701
font_01_sfnt_off00011359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11359 10576 bytes
SHA-256: 45dbbb7a829dbf594cb7dac72090f28d01422d6704815c552465f8db04948476