Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a891e870c3c26d…

MALICIOUS

PDF

72.5 KB Created: 2021-03-19 12:08:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3a13dcc26dbbdb530b4e60501b88d318 SHA-1: 9b54be05ae93a1885dc5b080722f209121eed7f0 SHA-256: 83a891e870c3c26df3adedc24bc3a77fb677ff555b4f3ea21674434aa1b95453
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, flagged as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary purpose appears to be directing users to other resources, potentially for SEO manipulation or to serve as a distribution point for further malicious content, aligning with a phishing or content distribution attack pattern.

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://botokaw.ru/aws?utm_term=very+basic+python+programs+for+practice PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459318/normal_604af460e9453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_60532528de300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_60134ee35beef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496828/normal_600aab6d1c771.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367294/normal_5ff284e21fb9f.pdfIn PDF document text
    • https://zumugewij.weebly.com/uploads/1/3/1/4/131483128/3020005.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480382/normal_5ffcab9a7cc53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447626/normal_5ff260013524f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_604f549247d4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458848/normal_604fe075d8baf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480412/normal_5fe20790d7b8d.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/eN9jcti/1866741614.pdfIn PDF document text
    • https://loxutagunepolu.weebly.com/uploads/1/3/4/7/134763456/vasoroba.pdfIn PDF document text
    • https://cdn.sqhk.co/xarobumevux/IYmvjjX/66526226888.pdfIn PDF document text
    • https://fomimixa.weebly.com/uploads/1/3/4/7/134775862/bivumeteseviwozowe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414335/normal_5ffb30a8ca8b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozadubokurego.epizy.com/how_to_open_viewer_app_in_jio_phone.pdfIn PDF document text
    • http://dezusuratadaf.rf.gd/mazisibigojadileviwimeri.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_off0000dc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC52 5604 bytes
SHA-256: 05795811df7ef0c7fb289b846e0a48e00112b8664306e77843c8500895db115c
font_01_sfnt_off0000ef4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 11076 bytes
SHA-256: 50036149ae1da591e22d15889252c3cf83c95f7dc7ada024fb0c43a18b5f769b

Open this report in the interactive analyzer, or submit your own file for analysis.