Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6ac5b3e1c0bc06…

MALICIOUS

PDF

82.0 KB Created: 2021-01-04 00:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f9475b486e1496e032564a4327a7b993 SHA-1: 9788f93371963eb810182256db53f8e4c2087e43 SHA-256: df6ac5b3e1c0bc065e1b5fc2858743f57697c37c8b1c198245c5c3c6b91bf32f
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains embedded links that redirect to a link farm, which is a common tactic for phishing or malware distribution. The primary malicious IOC is the redirector URL, which likely leads to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=conjuration+wizard+build+pathfinder In PDF document text
    • https://cdn.sqhk.co/busosuwik/HzUgd0X/run_hulu_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/MQiaVKr/nagori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423428/normal_5f9f95cb5231d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480182/normal_5fe56e0bc4b64.pdfIn PDF document text
    • https://biduvokiket.weebly.com/uploads/1/3/4/3/134367510/rogeburod_lelewejokuwip.pdfIn PDF document text
    • https://nilijinaxobizag.weebly.com/uploads/1/3/4/3/134356504/soxiporaxepeni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383146/normal_5fada67eba91e.pdfIn PDF document text
    • https://xejibojap.weebly.com/uploads/1/3/4/3/134310503/778485a80f.pdfIn PDF document text
    • https://zewubonorow.weebly.com/uploads/1/3/1/3/131398185/kejedobelezon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381347/normal_5fc4f92e683ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380869/normal_5fa7dfc1d6e14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e36fc4c3-826c-402b-be05-e9c4865a8799/central_crossing_high_school_band.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_off0000fc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2A 5216 bytes
SHA-256: cabe0c2cb714bef4c863d0d07c24a8597dc984c3985db133f42054947e647404
font_01_sfnt_off00010df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF4 13268 bytes
SHA-256: e2e82a8479f044e831def3f4bab0475b0d2a39c56677fe55a292a57883ab3c81

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