Malicious PDF — malware analysis report

Static analysis result for SHA-256 8885253a4ca64a48…

MALICIOUS

PDF

67.7 KB Created: 2021-02-14 01:04:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b85226d76a8aa44739152ad703459c42 SHA-1: 770a711bc2c536804fa5fe62ece48ac69d7868a6 SHA-256: 8885253a4ca64a48fe1fedce86f45231073bd57fcd53386661e8be6e4003927d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

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
  • 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 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.
  • 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://crophysi.ru/wix?keyword=honda+x8r+manual+pdf In PDF document text
    • https://muwalivom.weebly.com/uploads/1/3/2/6/132695892/58276e1d2007.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/jEihZf5/kilexixanetuluzuzigegexez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426267/normal_5fced0dfa81a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501037/normal_60152bea30e56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416928/normal_5feb95b85df33.pdfIn PDF document text
    • https://pepizowa.weebly.com/uploads/1/3/2/7/132711999/vikebetok_piputukupi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379379/normal_6027425c00132.pdfIn PDF document text
    • https://cdn.sqhk.co/sarafogu/g3eUcMg/mageluvezogilujoxanumosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484376/normal_60258f40316d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488574/normal_6019aed187914.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451752/normal_5ff2bdd22d21d.pdfIn PDF document text
    • https://dakogepakidi.weebly.com/uploads/1/3/5/3/135391125/katesuzidugaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484097/normal_5fd388a228cb9.pdfIn PDF document text
    • https://wemawamirake.weebly.com/uploads/1/3/5/9/135959397/xajadi_wapodujize.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5ff92bec8a0ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404107/normal_5fe295c912adb.pdfIn PDF document text
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/ce89993a97.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/vawoginele/psp_emulator_for_android_free.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_off0000cd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5F 5232 bytes
SHA-256: 4f5dd9fb820865744c936b06ad6bc53213c9f5eab17619c24503897d0e4ed1da
font_01_sfnt_off0000df19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF19 10088 bytes
SHA-256: 1c88066588005feab45fe903211a7b8cc2e5dbb947e94768563d21a2693e456f

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