Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c621ac129c27e11…

MALICIOUS

PDF

77.5 KB Created: 2021-03-13 22:01:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dc5bb2c589875de211aef605c52f3eee SHA-1: b73a68b5e060abc3f0c3661e12a2548c056bfbc3 SHA-256: 5c621ac129c27e11081bbd4b4be2db0d6aa7acbf302b5577df93ee4d64af232a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/wix?keyword=anatomy+and+physiology+cat+dissection+lab+answers PDF link annotation
    • https://ponixetuga.weebly.com/uploads/1/3/4/6/134668384/wowazure-lebakizar-weduwubilu.pdfIn PDF document text
    • https://cdn.sqhk.co/zirigajer/jaYgjjb/42025585646.pdfIn PDF document text
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/7133079.pdfIn PDF document text
    • https://batopida.weebly.com/uploads/1/3/4/6/134689087/zejox.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/d7hcjcR/nfl_sunday_ticket_cost_comcast.pdfIn PDF document text
    • https://manujemupofux.weebly.com/uploads/1/3/0/7/130738512/wilegisudugi-dupuvatog-xowunavu-gabetegi.pdfIn PDF document text
    • https://porukugo.weebly.com/uploads/1/3/1/3/131380087/8446b17474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486550/normal_6046cdfe3aabe.pdfIn PDF document text
    • https://rusofejez.weebly.com/uploads/1/3/1/8/131856127/5580421.pdfIn PDF document text
    • https://paxubemimowam.weebly.com/uploads/1/3/0/7/130739876/faraj_topaki_pakenu.pdfIn PDF document text
    • https://cdn.sqhk.co/xakalodesi/O4wigkM/chaita_video_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/zuwiwejagub/gcTrHUh/82313966526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_5fd88c98180bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460688/normal_5feb8840c2e56.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvajuvewuj/gHghgjY/chameleon_run_deluxe_edition.pdfIn PDF document text
    • https://gexawagezawa.weebly.com/uploads/1/3/2/6/132682787/84c8e4052f5584.pdfIn PDF document text
    • https://ketuvukelese.weebly.com/uploads/1/3/4/3/134351906/a9e2f.pdfIn PDF document text
    • https://diwolusetu.weebly.com/uploads/1/3/5/2/135299278/lisevoru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489259/normal_60113182ae859.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/9cf0f14a-1bf2-4721-96ac-689f203c9441/what_is_prepaid_card_in_usa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7feb371d-77a2-4b2a-8a19-e9e79dad0a34/90945691654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33c9ed8f-0af4-4288-985b-ebf3aa3c7651/50462505273.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_off0000ed70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 5808 bytes
SHA-256: 44bd336252b61c7e2d9f797d310583045e7c6d822d497f0735868a2890b8ba38
font_01_sfnt_off00010129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 11500 bytes
SHA-256: efa025f05cf0d55f17a4072a3e5ba9ae40a78f8f1fba6f07a81ab547c4e84601