Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8a401bf2f8f3e7…

MALICIOUS

PDF

83.3 KB Created: 2021-05-18 00:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b0708722c47e69ff31a2f2669d4e48d5 SHA-1: 431dcebfdce36ead94e94984bec45c6e50b216d2 SHA-256: bd8a401bf2f8f3e7bfa4c5b93ae63702a245cd6bec75c06366d81f4116fd2ced
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'vilenefex.ru', suggesting it functions as a lure to external malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

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://vilenefex.ru/strik?utm_term=edexcel+igcse+french+vocabulary+list+pdf PDF link annotation
    • http://nomolizuxabid.22web.org/ocean_city_nj_tv_channel_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422658/normal_60623cc2662c1.pdfIn PDF document text
    • http://zugoruvupigit.iblogger.org/31308626919.pdfIn PDF document text
    • https://sesumevikenaful.weebly.com/uploads/1/3/5/3/135346106/ad6375f02628.pdfIn PDF document text
    • http://zanetapoxod.22web.org/92714153929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420752/normal_603d1c81c417d.pdfIn PDF document text
    • https://rarasuxa.weebly.com/uploads/1/3/1/3/131398432/xuwixokaxavivupumix.pdfIn PDF document text
    • http://didanak.22web.org/sujir.pdfIn PDF document text
    • https://kowedogade.weebly.com/uploads/1/3/4/8/134879104/8086258.pdfIn PDF document text
    • https://rasizuxuner.weebly.com/uploads/1/3/1/3/131378923/xuvizusig-buwesut-jimawesanawofij-nupokopifipu.pdfIn PDF document text
    • https://dasirexifavud.weebly.com/uploads/1/3/5/3/135320576/bf2cde7687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403563/normal_6064bc6a58d1a.pdfIn PDF document text
    • https://girosiwubu.weebly.com/uploads/1/3/0/7/130740458/0beaf6353590c23.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tefefusojobus.rf.gd/17258098993.pdfIn PDF document text
    • http://mibexumobanoko.rf.gd/bvd_in_cattle.pdfIn PDF document text
    • http://judegedemo.rf.gd/faringoamigdalitis_aguda_bacteriana.pdfIn PDF document text
    • http://busugotuwege.epizy.com/52771432245.pdfIn PDF document text
    • http://jakumivizod.epizy.com/attestation_sur_l_honneur_divorce.pdfIn PDF document text
    • http://pudawetik.rf.gd/flight_of_the_bumblebee.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_off00010632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 5744 bytes
SHA-256: a2808f8462819246260ac43e148dfd7512b2883e1c9d52ba5c5ac18ef596efd9
font_01_sfnt_off000119ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CA 12084 bytes
SHA-256: 20dcd67e366730dca9c2d15c8a39db762d8edc0fcc33e94fdc65c97645fd149e

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