Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f51df4043c7001d…

MALICIOUS

PDF

84.8 KB Created: 2021-02-04 23:30:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9b77ed98235723041a0884837b9a1966 SHA-1: e16b0623159a6d570af4117c71789a22b5e7f309 SHA-256: 8f51df4043c7001d2ab3c760bb06482d1ee3793817835ef8ca8322aa1d883969
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 other PDF files, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of an attempt to redirect users to malicious sites.

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 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://druttle.ru/123?utm_term=a+raisin+in+the+sun+full+text+online+pdf PDF link annotation
    • http://educationonline.website/drake_l4b_modsnflwu.pdfIn PDF document text
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/9031109.pdfIn PDF document text
    • https://cdn.sqhk.co/rosojolude/nM3hhLM/1st_grade_writing_activity_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/dwND0Nl/55511871586.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/jbhfP4r/17835925220.pdfIn PDF document text
    • http://tcerkovniekupola.space/kalutanukapelomutge38.pdfIn PDF document text
    • http://about-igsupport.com/newstar_diana_blogql2ak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467273/normal_600656dc77b53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445558/normal_5fed199502114.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388282/normal_5ff1944ada267.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393751/normal_5ff21ead77f16.pdfIn PDF document text
    • http://cparta.moscow/witixujonitixelomegm4b3n.pdfIn PDF document text
    • http://rezltml.xyz/63997453503j41vn.pdfIn PDF document text
    • https://cdn.sqhk.co/nenafodud/hgmifjU/finoputisisox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402503/normal_5ffed17d1ed21.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/genifufik_juxilil_masukiva_ridinojuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11047 5184 bytes
SHA-256: 3f69bc43bbde01283cf1db9fdab97af09a5868e9e68e8352ac7b3cfa6cd44a5f
font_01_sfnt_off000121e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E9 10476 bytes
SHA-256: 5951fd31d08104034b057965009c505ad7df39f46aae3d99b11a3a9a911a564f

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