Malicious PDF — malware analysis report

Static analysis result for SHA-256 435d722524be5228…

MALICIOUS

PDF

74.7 KB Created: 2021-02-26 21:07:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 090c663855b825d855fa65687b083a28 SHA-1: 29b0f3e445533306c6067485326b29a0c65fd25b SHA-256: 435d722524be5228f617238f3e42715a8b674eae13613a9c131b3a1af454ade6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns are consistent with a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://druttle.ru/award?keyword=how+to+keep+a+running+record+for+reading PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417426/normal_5fd2f85bd2acd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413236/normal_5ff26b01cb612.pdfIn PDF document text
    • http://menformula.xyz/zanisarep388.pdfIn PDF document text
    • http://idealsit.space/white_christmas_lyrics_bing_crosby7y74q.pdfIn PDF document text
    • http://lightly.store/tigetolofapetufemie8y5g.pdfIn PDF document text
    • http://katipef.medianewsonline.com/54361193006.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/futozesuremaxovekumopabo.pdfIn PDF document text
    • http://copyrightviolationcenters.com/6178381461358ufn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384045/normal_600031d62e1dd.pdfIn PDF document text
    • https://pimipile.weebly.com/uploads/1/3/4/8/134883166/7c612b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418987/normal_601cd143b678f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nojikigor.myartsonline.com/23332325934.pdfIn PDF document text
    • http://rojotafapexaj.rf.gd/84230019191.pdfIn PDF document text
    • http://zagofij.onlinewebshop.net/70319224834.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

Related samples 8

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_off0000e7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CC 5228 bytes
SHA-256: e6a0d16b2e97e02384e876f8af34d98a410c6c1ad4db32317952b6dd191328d2
font_01_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 10476 bytes
SHA-256: aef40a6ba95d4ed11140f54b83ff6aebe5c64b7f3c7cb9a0b9e27fb3993e4339

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