Malicious PDF — malware analysis report

Static analysis result for SHA-256 3023019ac6cb0644…

MALICIOUS

PDF

75.2 KB Created: 2021-03-02 07:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5a9e2e81d60e31b1b85d7c61128245f2 SHA-1: da953522967d745f3ec86cadf7de198e56a07a13 SHA-256: 3023019ac6cb0644c2de9fd3b59ada502ba1ea6f49220fa09a2c0bc0b65e95ef
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 phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jumiwimov.ru/strik?utm_term=trigonometric+equation+calculator+wolfram PDF link annotation
    • https://cdn.sqhk.co/pifajaloro/idxjijQ/best_short_track_racers_in_nascar.pdfIn PDF document text
    • https://cdn.sqhk.co/zixifazod/ciaggg4/mamajuruxepix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409619/normal_5ff7974e0540d.pdfIn PDF document text
    • http://drive4mclaneaustell.com/spring_mvc_test_framework_tutorialhifow.pdfIn PDF document text
    • https://cdn.sqhk.co/ramojezi/epjdjj3/online_graphing_calculator_with_table.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497346/normal_6002395234c07.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/jaidKij/nosomakafer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_5fd3db7d38fd1.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/46184733093.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/jfzL4Oo/jixuwusexenenezo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460983/normal_60188b4fd598f.pdfIn PDF document text
    • https://cdn.sqhk.co/vitozogog/gcgeugc/7566286825.pdfIn PDF document text
    • http://ionatr.fun/24432899797ewen2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_6021ba0659212.pdfIn PDF document text
    • https://peniseguj.weebly.com/uploads/1/3/2/7/132712198/gekog_ganufolef_wegisiwi_vebusev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimixof.onlinewebshop.net/the_constitution_of_liberty_hayek_summary.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_off0000e622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 5188 bytes
SHA-256: 395603bdb928416097a5201ccfe86d373f58232376ee6777ea7133deb0311fb1
font_01_sfnt_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 11788 bytes
SHA-256: e9741927a8ae090d433978385e2b15619567a760adacd363c6363875d4b85f11

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