Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a9bb91b7f9e8f4…

MALICIOUS

PDF

74.3 KB Created: 2021-02-19 11:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4c5adeb867a231ebc3a3283757d1313b SHA-1: 4d95d2a0eb390f48f1de9d888b1be480ff2fa407 SHA-256: c0a9bb91b7f9e8f45b677aa3d18352dbeec5ece29c2eb084bd4a6ac23051dbdb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or SEO poisoning attempt. One of the primary external links, 'https://baarspo.ru/strik?utm_term=how+to+stretch+strappy+high+heels', is likely a lure to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://baarspo.ru/strik?utm_term=how+to+stretch+strappy+high+heels PDF link annotation
    • https://domemasajexal.weebly.com/uploads/1/3/5/3/135304114/fatawepamuxozari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453906/normal_601a9b731e2a7.pdfIn PDF document text
    • https://mufajagirudul.weebly.com/uploads/1/3/1/4/131452858/jugegolegifalesazi.pdfIn PDF document text
    • http://car-test.pro/critical_thinking_processgksq7.pdfIn PDF document text
    • https://zaxefuki.weebly.com/uploads/1/3/5/2/135299090/e414a7288e8534.pdfIn PDF document text
    • https://migijulomav.weebly.com/uploads/1/3/5/3/135394851/e2acf132f184e4e.pdfIn PDF document text
    • https://mefimume.weebly.com/uploads/1/3/1/4/131437875/655567.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/63245360813.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/bermuda_adidas_performance_essentials.pdfIn PDF document text
    • http://vumebef.epizy.com/23674034461.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/anti_inflammatory_diet_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/gifugaz.pdfIn PDF document text
    • http://duloduxu.epizy.com/alien_covenant_full_movie_in_tamil.pdfIn PDF document text
    • http://zaxutakizet.epizy.com/rafikoritobasifijapide.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_off0000e781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 5352 bytes
SHA-256: 1425f09ef29d0ae8ec1dd03c015ec91ccf237092d48443c400b14cc3b1297038
font_01_sfnt_off0000f9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 10048 bytes
SHA-256: 8b07e4fdbce287a7069344d59b444c6a619e0d7150f559063e6be44eab040171

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