Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b3a0fd57e88340…

MALICIOUS

PDF

75.9 KB Created: 2021-03-25 21:40:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 40e76d38eeebdb09ee2dc2344511b43a SHA-1: 809524f01c035100947c6b7d767b526ad5f9b05f SHA-256: d7b3a0fd57e88340c49332834773a88f73dcc571e6bfb694314e264f5aa7bec6
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary malicious URL identified is https://mezovuduw.ru/strik. The document body is heavily obfuscated and unreadable, but the presence of numerous external links indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=pogonophobia+oxford+english+dictionary PDF link annotation
    • https://rexakutomas.weebly.com/uploads/1/3/0/7/130739652/bikegatu-dibiteso-kitedevajaj.pdfIn PDF document text
    • http://potozafit.medianewsonline.com/abnormal_psychology_barlow_8th_edition_free.pdfIn PDF document text
    • https://renixopofofof.weebly.com/uploads/1/3/4/4/134486295/dodoxag.pdfIn PDF document text
    • https://babekezuxosonat.weebly.com/uploads/1/3/5/3/135327288/limitivotesufe.pdfIn PDF document text
    • https://tazomisoz.weebly.com/uploads/1/3/4/3/134344853/pakujo.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/98197706808.pdfIn PDF document text
    • https://rogiguzuma.weebly.com/uploads/1/3/1/4/131438844/bazidexer.pdfIn PDF document text
    • https://geridaradekod.weebly.com/uploads/1/3/1/4/131437552/wowutumogirorizowale.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/265bc5e720.pdfIn PDF document text
    • https://besuxape.weebly.com/uploads/1/3/4/3/134374749/losabutusirodap.pdfIn PDF document text
    • https://powipopes.weebly.com/uploads/1/3/1/4/131406611/2825730.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_aef9d99e337e4fc6aa6dc8bbfc9dd5b8.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_c9859d5d01094eeab5238b02fc640477.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_39911b9a738249978e86af95ac61b242.pdf?index=trueIn PDF document text
    • http://matixonapoler.epizy.com/barrera_hematoencefalica_componentes.pdfIn PDF document text
    • http://navezep.epizy.com/99972357916.pdfIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_7c30ec3bc69f4abb80dbf9b59c0b7a4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/xinimuwogekapuxaxiret.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/65760184496.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_off0000e59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 5728 bytes
SHA-256: b3b2eccc1816bb42065dcde6655cb58f7af1eb9a1f9bcb69edc139fd3198da80
font_01_sfnt_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 12608 bytes
SHA-256: 5002173c30726d20ae5d9a358daefb823dd76a782738d8f01aeda36cc4defd86

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