Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f556c387730351…

MALICIOUS

PDF

66.7 KB Created: 2020-12-07 20:39:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d483544bb06d64b2db23c30776689e85 SHA-1: db726b97982e74cf1beb05f2bfb07bbc9cfc603c SHA-256: 99f556c3877303512568c4f5944cc19235f6210a20b2f973d38495c90b616486
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://trafffe.ru/strik?utm_term=cis+vs+trans+genetics PDF link annotation
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/5051893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501789/normal_5fab973938a65.pdfIn PDF document text
    • https://tubumafipe.weebly.com/uploads/1/3/4/4/134458357/pomogebiwu.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/e8631.pdfIn PDF document text
    • https://gikowotezura.weebly.com/uploads/1/3/4/4/134493608/xumub_lupibed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406793/normal_5f94ccab2838e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/68e2ccd6-bb22-44b8-ac9b-c6ce98fffa6e/mojitesevebujotejozilojit.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/jurnal_titrasi_asidi_alkalimetri.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc36c8fec917750a3e7ce8f/t/5fc94354db7ea931cce262c4/1607025494116/serie_vikings_bjorn_morre.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/tigedixagaleviwadasoza.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3342111f6a4198494abb4/t/5fcbf6a07ae85b53b27b212d/1607202473766/green_neon_sign_black_background.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_off0000c8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CF 4900 bytes
SHA-256: 0e88845c9b684ea22a469c03522731fad2c19547668e5dedafb02dd0ce91c701
font_01_sfnt_off0000d990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 10880 bytes
SHA-256: be9860d2bfe7a88421dee091d0ff9206cfe9f911d259559f4f232f911e598465

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