Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf089c027108b92…

MALICIOUS

PDF

78.9 KB Created: 2021-02-26 01:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9abaaac39c6ebbb8df4c2f5450a27187 SHA-1: 25293c869127c68bc55ff971458fed839424e6c0 SHA-256: baf089c027108b926fd67b74861238384777149701a5c26e30340bb36a47b89d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated, but the presence of URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards a lure to external malicious content.

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://maypoin.ru/strik?utm_term=spring+in+action+4th+edition+pdf+%25D0%25BD%25D0%25B0+%25D1%2580%25D1%2583%25D1%2581%25D1%2581%25D0%25BA%25D0%25BE%25D0%25BC PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383302/normal_600beb319faa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456998/normal_60163777d53ff.pdfIn PDF document text
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/ripomosaruv.pdfIn PDF document text
    • http://vinnipoh.fun/bug_out_bag_gunsil00c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461525/normal_5fd7b44e2276f.pdfIn PDF document text
    • https://jiwozipepogi.weebly.com/uploads/1/3/4/4/134462700/01fd450e90e394.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473432/normal_5fff15bfb7e42.pdfIn PDF document text
    • https://jumomemokipus.weebly.com/uploads/1/3/0/8/130874307/penati_guseli_suror.pdfIn PDF document text
    • http://ketosimple.online/10917422347mittc.pdfIn PDF document text
    • http://sewenosafi.22web.org/2175609313.pdfIn PDF document text
    • http://effektzhizni.ru/saps_forms_2019v61pz.pdfIn PDF document text
    • http://omoikiri.info/500350473045a61k.pdfIn PDF document text
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/6579426.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://legumanob.rf.gd/furosemida_efectos_secundarios.pdfIn PDF document text
    • http://sibesexewelemu.rf.gd/duniminegamafagosilex.pdfIn PDF document text
    • http://fezefujeziged.epizy.com/22174191244.pdfIn PDF document text
    • http://vifixokosakagos.rf.gd/76942077074.pdfIn PDF document text
    • http://sexikiti.epizy.com/who_makes_rheem_furnaces.pdfIn PDF document text
    • http://bibuxidon.rf.gd/android_tv_app_keyboard_not_working.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_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 6300 bytes
SHA-256: 25de545bea097d0f0ff3948c8d8e7ab3877c27e7d755ace8b74e9283670c6041
font_01_sfnt_off0000fc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 15164 bytes
SHA-256: d408094266882da0076385851386b8e371b2da7a6bcbedaaed21187624fc86c7

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