Malicious PDF — malware analysis report

Static analysis result for SHA-256 6406d9dcd03511a8…

MALICIOUS

PDF

83.0 KB Created: 2021-01-14 20:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 393b6115742e700f718796a465ad2c4c SHA-1: 93d13f10d07025557a2d21358daf3a4d84f84455 SHA-256: 6406d9dcd03511a8393969e09430bb29d76a7b570f9b720de9c3d0072e8099b7
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and some to known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document's structure and content suggest it's designed to lure users into clicking these links, potentially leading to further compromise.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://gettraff.ru/123?utm_term=boy+gets+girl+script In PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/5590407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413236/normal_5f948c997369e.pdfIn PDF document text
    • https://likotemeg.weebly.com/uploads/1/3/4/4/134464786/juliwufafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5fbefbb3bbc1d.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/2jfnQig/48191734209.pdfIn PDF document text
    • https://woteginawewe.weebly.com/uploads/1/3/1/3/131379999/8926252.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/mavomoxepelotixuwoxu.pdfIn PDF document text
    • https://bivitomelonex.weebly.com/uploads/1/3/4/4/134491730/demuluzuti.pdfIn PDF document text
    • https://site-1173285.mozfiles.com/files/1173285/riders_on_the_storm_movie_2020_trailer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447270/normal_5fed64ac67e93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460457/normal_5fab957c4caaf.pdfIn PDF document text
    • https://site-1174236.mozfiles.com/files/1174236/barbie_dreamhouse_adventures_game_mod_apk.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 5040 bytes
SHA-256: c85e585959d2bdb364f04d34d44c74ca303d5aa9108a8921420f22c15f3adc30
font_01_sfnt_off000119d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D4 10996 bytes
SHA-256: 2f3aaa69bcbc6dce88cf650ee359a8f810576160b9a036dfddd3c51a8ddae983

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