Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be651e98e63fc00…

MALICIOUS

PDF

72.4 KB Created: 2021-03-27 22:30:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1c14c608de79fd21c30bcca02c398cf7 SHA-1: 2199dc8d36d6889d91609cff9adb5ee8292c4306 SHA-256: 4be651e98e63fc004d0ea4ad11eed632e13dc8bb148ae9a03d2b8c30651eb531
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are used to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=casio+g-shock+limited+edition+radio+controlled+bluetooth+solar PDF link annotation
    • http://vobugefu.22web.org/30478346194.pdfIn PDF document text
    • http://bemixavojutok.iblogger.org/96792357746.pdfIn PDF document text
    • https://rijagadufe.weebly.com/uploads/1/3/1/6/131606992/2021905.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/Jihhax3/fifa_soccer_2020_game_mobile_apk.pdfIn PDF document text
    • https://jipofaxinevafud.weebly.com/uploads/1/3/4/3/134350183/cbd8f41ad.pdfIn PDF document text
    • http://lozosomegav.iblogger.org/jojaxodajemilife.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/Uiadijv/zuzililopetile.pdfIn PDF document text
    • https://kaferafodi.weebly.com/uploads/1/3/0/7/130775544/2514684.pdfIn PDF document text
    • https://xusemiwo.weebly.com/uploads/1/3/4/8/134899199/3c554165a6c3.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/xolitajapaw.pdfIn PDF document text
    • https://xadajosawot.weebly.com/uploads/1/3/1/6/131636584/dd13afce069ac4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://busugotuwege.epizy.com/leadership_styles_books.pdfIn PDF document text
    • http://tixinova.rf.gd/manual_radio_citroen_c3_2008.pdfIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_4f8490132df940d0bdfdaf175d1f2853.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_28701cb201db4111bcb9046ad0680db5.pdf?index=trueIn PDF document text
    • http://welerepo.rf.gd/62732829210.pdfIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_60dcf4016eec45aea744ea21169a14b4.pdf?index=trueIn PDF document text
    • http://wudobew.epizy.com/former_rain_and_latter_rain_in_israel.pdfIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_db93d936777d452ebb1bc89289d8ff95.pdf?index=trueIn PDF document text
    • http://fogusevo.epizy.com/bls_algorithm.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_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 5492 bytes
SHA-256: f88f88f2eb5b8ec3c3f681d66d91d41f600558b25c634c5548ef573b3dc68e3b
font_01_sfnt_off0000ef0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 10760 bytes
SHA-256: ede69c24b49960cc353aee525a2e5014477236a300e12c0132f0dd85b3d903da

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