Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c20d9b45435c020…

MALICIOUS

PDF

74.9 KB Created: 2021-02-28 09:22:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ca80d310e2b35b547f498e207316110c SHA-1: dcbe59d8d87980fc87e4866dbf0a2688c4a3d290 SHA-256: 9c20d9b45435c02008d48f5ebac973fa63bf1e119401110210ccc5315f831bc7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a high number of external links, many of which point to SEO-optimized PDF files hosted on various domains, suggesting a link farm or phishing campaign. The presence of a redirector URL like 'https://vilenefex.ru/aws?utm_term=oster+waffle+iron+recipes' indicates an attempt to lure users to malicious content. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/aws?utm_term=oster+waffle+iron+recipes PDF link annotation
    • http://loduwij.scienceontheweb.net/14336606142.pdfIn PDF document text
    • https://kamobukumigudeg.weebly.com/uploads/1/3/1/0/131069934/wuxitojuze_dezujijolisit_sewamepiwezamir_kafejinub.pdfIn PDF document text
    • https://pawagidi.weebly.com/uploads/1/3/1/1/131164052/gomerokim-wirerejavewe-vewiwewug.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/how_to_use_macros_in_google_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/ebola_virus_disease.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/novuboxitabovati.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/cyber_security_courses_online.pdfIn PDF document text
    • http://youralteragoods.com/wu_tang_clan_real_names_hulue8zna.pdfIn PDF document text
    • http://bilet-pdd.site/how_to_reprogram_ford_instrument_clustera6ay0.pdfIn PDF document text
    • https://lolujimibo.weebly.com/uploads/1/3/0/7/130740441/2cc70.pdfIn PDF document text
    • https://baputopozim.weebly.com/uploads/1/3/5/3/135336161/123e2c26a10e2.pdfIn PDF document text
    • http://kismykeitio.best/19157712141gwcp2.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/70650968531.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/jogexizipekirikotumaw.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/medenofowuxo.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 6

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_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 5128 bytes
SHA-256: b67aa92efb94ac10e14de50024ea1c86cda281668c8ea7b660321fce58244e6d
font_01_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 10488 bytes
SHA-256: 1a9a30f49070715f563abad01cef9d6f82ce1c501dd9acd1053317cf3a78dfb4

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