Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b4598fb42a85be…

MALICIOUS

PDF

78.4 KB Created: 2020-12-21 19:46:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 246d1a1eb79954e3ff1565ea70355cc1 SHA-1: 07d80b9aba7bad41e17c7d42d9f64ac966d6d764 SHA-256: 53b4598fb42a85be05e54116b93e07207555ebd22178542fa1709247f5774f57
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains an embedded URI pointing to a suspicious domain, identified by ClamAV as 'Pdf.Phishing.Trojan'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to contain metadata related to the lure, suggesting a phishing attempt to redirect users to the provided URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://traffking.ru/strik?utm_term=genetic+disorder+definition+biology PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416132/normal_5fcdf3c626960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465024/normal_5fbce83772a6f.pdfIn PDF document text
    • https://loruwudo.weebly.com/uploads/1/3/4/7/134738316/3533279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484818/normal_5fc1b95cbeb09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_5fb4c341b408f.pdfIn PDF document text
    • https://guboriratuji.weebly.com/uploads/1/3/4/2/134235556/ea6c1d48d7a68.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/vaxujow_gebonem.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/wetevali/xibumam.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/poxozunip.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc81a80526ad1a5999a26b/t/5fdd160169ef8811ad7b7fa5/1608324613463/fovura.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5aa07ea4a794d5665c0d8/t/5fd1e1c1ef89ac668378cab1/1607590340645/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dfe5197-6491-4d96-807d-c42d95c00ee0/52203673975.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_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 5252 bytes
SHA-256: 27474a422da1319552471b2a5ad9329d878afec83e03c13a9954d4a43ab51df0
font_01_sfnt_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 12488 bytes
SHA-256: a01bbd126e7b3e94bc0a5e5cb5f02d080f492528becdf83d5566bde9c0765755

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