Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc8f09aadcbb9d7…

MALICIOUS

PDF

107.0 KB Created: 2021-02-19 20:15:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 4353ac77fe4f5dbf3abf520d97638257 SHA-1: b3dd3b1d42b0aefb3b7e9df670cd8ca7b0a96cf2 SHA-256: 9cc8f09aadcbb9d7e2862754b237d17a13d8c6c62533e3fdb2ec0f7afc9a65bc
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malicious content. The presence of external URIs and the link farm heuristic strongly suggest a redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://jacksth.ru/123?utm_term=observational+zymology+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5feb505079101.pdfIn PDF document text
    • http://vbruti.site/what_does_the_word_self-knowledge_meani7x3t.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/AbjjhdK/kegaresumaminamikob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427498/normal_5fe9023f4f513.pdfIn PDF document text
    • http://copyrightshelpcenter.com/cgnat_mikrotikhcdzj.pdfIn PDF document text
    • http://avit0.cc/25748333125u3y7y.pdfIn PDF document text
    • http://metikinave.22web.org/prokaryotes_bacteria_and_archaea_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/jhsQhwo/88990456111.pdfIn PDF document text
    • http://meweremidef.iblogger.org/xodebofim.pdfIn PDF document text
    • http://raifaisentapp.online/chi_square_practice_problems_answer_keywgdmk.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/WpNZHje/50533190793.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/higigj1/virus_news_massachusetts.pdfIn PDF document text
    • http://new-volosi.ru/wd_my_passport_wireless_ssd_vs_projebap.pdfIn PDF document text
    • http://samoe-samaya.ru/pejedafiripebovurajewoo4mnj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lawubipala.epizy.com/my_talking_angela_apk_mod_hack.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_off0001689a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1689A 5384 bytes
SHA-256: 811c18c891aa119122cf3eed917eaca360335b7c71ad6a8024fcd583d5496148
font_01_sfnt_off00017ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE2 10608 bytes
SHA-256: 99d9e0df7b7e74ae95699cd55ddd6687bf89e3b3b43e8a26ca0ab8de96a91d04

Open this report in the interactive analyzer, or submit your own file for analysis.