Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa8cfe45ba708be…

MALICIOUS

PDF

74.8 KB Created: 2021-02-11 14:23:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d1f2f2559b52333450da2e7bea4faad2 SHA-1: c72d73a7223664a87ac7aa98611aa2cf77aa1268 SHA-256: caa8cfe45ba708be83e1e88553a8eab90847e02a07186659cd8e2c8a5e46b024
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classification and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to reference 'impossible quiz 24', aligning with the link farm's apparent purpose of driving traffic through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=impossible+quiz+24 PDF link annotation
    • https://cdn.sqhk.co/kikutajaz/71S7hhT/jakiforagagowogop.pdfIn PDF document text
    • http://maxawasoreveta.iblogger.org/gikerexomifanuva.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/5hbrlhg/45720927547.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/HSjeHgj/57517401372.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/9jhM1hj/55062665786.pdfIn PDF document text
    • https://rejudizik.weebly.com/uploads/1/3/4/7/134701546/7960fc.pdfIn PDF document text
    • https://kibewuzogoluwiw.weebly.com/uploads/1/3/1/6/131636689/rojolute.pdfIn PDF document text
    • http://topepuxabi.iblogger.org/21512967935.pdfIn PDF document text
    • http://jatuligirez.22web.org/alvida_naat_status.pdfIn PDF document text
    • https://jufozawuvinuxak.weebly.com/uploads/1/3/5/3/135326647/3030576.pdfIn PDF document text
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/9868176.pdfIn PDF document text
    • http://kopawaruda.22web.org/intercontinental_hotels_group_plc_annual_report_2018.pdfIn PDF document text
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/vobugujunedidu.pdfIn PDF document text
    • https://cdn.sqhk.co/nakusunegud/ih7ggU1/bandicam_free_trial.pdfIn PDF document text
    • https://xotinibawilufo.weebly.com/uploads/1/3/1/4/131437660/0286d.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxofalu/hj1gfnI/wivupurinijabuxiwaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lejipuzab.epizy.com/fallin_all_in_you_piano_sheet.pdfIn PDF document text
    • http://wofaketizezoja.epizy.com/afrikaans_music_albums_s.pdfIn PDF document text
    • http://tixuxunu.epizy.com/1701934164.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_off0000e6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 5132 bytes
SHA-256: 3091dbf40f4721e06339f29bd06f04867c618b6bfa8e3c054df6d7532f5a1ab1
font_01_sfnt_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 11116 bytes
SHA-256: 414d6c689d62281b736469fd47d5f4dd7b6b3ca2184f097455f30873ab4bf018

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