Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a70e03833feef8…

MALICIOUS

PDF

75.5 KB Created: 2021-05-08 08:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 767761289a98f9ad0f1df53ab196c996 SHA-1: efbb4d41d1d85f71ec985bd8658a66010b9c32f2 SHA-256: 40a70e03833feef8b2745d98f46c73f0b257696a288327abdb28188bcc814e33
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support a phishing attack pattern.

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://golowaki.ru/strik?utm_term=maple+leafs+blue+jackets+tv+schedule PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4461525/normal_5ff5d0a82327c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491168/normal_60663ed6d1dae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453344/normal_6063b276303ad.pdfIn PDF document text
    • http://fruittea.space/pezigiruritivemdkakd.pdfIn PDF document text
    • http://iwhite.space/18682025513zynmq.pdfIn PDF document text
    • http://natlab.ru/lufubafolemugufagizusaretwsw04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417033/normal_5fcc4c6077374.pdfIn PDF document text
    • http://thecabinets.xyz/kenmore_600_series_washer_lid_switch7xba8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470699/normal_60121e29843f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_6010c50f1d24c.pdfIn PDF document text
    • http://hookup757.fun/506222701249jxp9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392442/normal_5febb140e385c.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/59552838-c1fa-4209-ad0c-b9a05d44763e/22443788383.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/firestore_android_kotlin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f86f6a0e-90d9-4fbc-a97a-0fbe7346bf95/51599940999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6188cd4f-ca8a-4231-89c2-2ea95a1e02f7/discrete_mathematical_structures_kolman_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/kejivavadividagerem.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 5492 bytes
SHA-256: 2651750c700a691c716739134b8c5e9835e018becdcab46ccc53af371665cbdb
font_01_sfnt_off0000faa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 11052 bytes
SHA-256: 0e2444216d59d8f7fafa89228366f457d42d894d87fda8dee8324e79b2c62a25

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