Malicious PDF — malware analysis report

Static analysis result for SHA-256 54628970c286a4af…

MALICIOUS

PDF

72.2 KB Created: 2021-02-25 21:55:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c71291433e3186c9c993b14fc69db76b SHA-1: d1cacebfde391921974701c194d1419e4d0708be SHA-256: 54628970c286a4af74be079f49d139d5dc4e47a6aa3c0e02eed9644078d7e237
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model also indicated maliciousness with high confidence. The document contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates the PDF is a link farm on disposable hosting, reinforcing the malicious intent.

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://bologen.ru/strik?utm_term=statistic+and+probability PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384150/normal_6018d0379d33a.pdfIn PDF document text
    • http://vaworudewu.iblogger.org/eiffel_tower_ka_photo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497646/normal_5ff88ef3155fc.pdfIn PDF document text
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/parudubasug.pdfIn PDF document text
    • https://vijunisuli.weebly.com/uploads/1/3/0/7/130775087/d4bf72bd928.pdfIn PDF document text
    • http://dapumad.iblogger.org/brene_brown_definition_of_vulnerability_dare_to_lead.pdfIn PDF document text
    • https://pabibajezejav.weebly.com/uploads/1/3/5/3/135323938/6a2a2c37e4deb02.pdfIn PDF document text
    • http://doresal.22web.org/martin_luther_king_i_have_a_dream_complete_speech.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423148/normal_5ff1b294650b2.pdfIn PDF document text
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/sewifesamobuluf-femedab-vitibubesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478932/normal_60114aa25f535.pdfIn PDF document text
    • https://meremunodimabak.weebly.com/uploads/1/3/4/5/134516451/fidewuwaneva_sowov_zebufip_mabitarojuxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bovubodomumid.epizy.com/bokezonurivijakenarefu.pdfIn PDF document text
    • http://masomivi.rf.gd/uti_signature_attested_form.pdfIn PDF document text
    • http://fivemawafazixi.epizy.com/venesasizevomaboporugi.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/23316376819.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/ridulavizolemo.pdfIn PDF document text
    • http://vifudirowu.rf.gd/noxuxuvajimomiwakamofiniz.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/nuzufozivadi.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_off0000dda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 5412 bytes
SHA-256: 603e921f0aaad595f6f62f6ce80c54edff4648c1254e6dae2d36cdb5fa3d6288
font_01_sfnt_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 10488 bytes
SHA-256: bc61e374b39a84d8d96ee2253d8e02aceac206469eee72b143073f10f1d1aec4

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