Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b42c393865659e5…

MALICIOUS

PDF

78.1 KB Created: 2021-06-08 07:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7763f09affdc6d2d3876f99e79e69aa4 SHA-1: b6734c3e34ae51d0a218acef376fb2ca96266d9a SHA-256: 3b42c393865659e5322a567e0239d5634c2e4abeb303e9d929ab97e2be394375
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a link farm on disposable hosting, which is a strong indicator of phishing or scam activity. The ML classifier and ClamAV detection further support the malicious nature of the file. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pistant.ru/pbw?utm_term=how+to+become+a+certified+scentsy+consultant PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464702/normal_5feddf9947e0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485005/normal_605612d27ab98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418197/normal_6041cb76afeef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404980/normal_60ba4b737094c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478946/normal_6066f295149e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475376/normal_600a0765c95fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_6055e23b235af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416802/normal_6005a1504c414.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/d4cd4937-38c2-4e58-a527-58d0e0afcb27/lujosavoxerekawoxejite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/019c07ee-82ab-42bc-b71d-36a5f9e2434f/when_should_we_recite_surah_waqiah.pdfIn PDF document text
    • http://mavujeridolu.pbworks.com/w/file/fetch/144501291/top_100_drugs_online.pdfIn PDF document text
    • http://wenitudodub.pbworks.com/f/mabebetalepapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b130b2a-6141-4790-a875-3651aacd7e69/wolapex.pdfIn PDF document text
    • http://zipiwume.pbworks.com/w/file/fetch/144820560/you_dont_know_javascript_async_and_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e236313-7923-4a91-bed3-122406c60b49/what_does_maiden_voyage_mean_dictionary.pdfIn PDF document text
    • http://nekimijazom.pbworks.com/w/file/fetch/144669771/sizekururimapa.pdfIn PDF document text
    • http://kivotin.pbworks.com/f/is_tlauncher_illegal_in_canada.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/w/file/fetch/144562188/3971921103.pdfIn PDF document text
    • http://barumena.pbworks.com/f/jlpt_n4_kanji_practice_sheets.pdfIn PDF document text
    • http://motekus.pbworks.com/f/como_descargar_adobe_audition_1.5_gratis_en_espaol.pdfIn PDF document text
    • http://kalunagepigi.pbworks.com/f/barani.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144418614/what_are_the_best_types_of_coffee_beans.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_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 5460 bytes
SHA-256: f5d16768c4dc80f7a7e55716aa3ee3c57fb698fd51a85d6f90c6e02696cebf39
font_01_sfnt_off00010398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 11476 bytes
SHA-256: a3fd58c1316516e33ab281fc64cb0a03847061d59e877cae10f5059088e0bf15