Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d9a76ec5942fbb…

MALICIOUS

PDF

61.4 KB Created: 2020-12-28 09:22:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 00b82cf99f2481913f1898be01922217 SHA-1: 9ab10d93f943270385451161205a30b9136e588e SHA-256: 66d9a76ec5942fbb8c45fc470e0dcddbea250c3fc655877542728823efabd2af
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The presence of a URL with 'utm_term=prank+caller+pulp+fiction' suggests a lure for potentially malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://traffset.ru/strik?utm_term=prank+caller+pulp+fiction PDF link annotation
    • https://wugebanog.weebly.com/uploads/1/3/4/7/134709888/wedove.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/da97745f.pdfIn PDF document text
    • https://pimuvetu.weebly.com/uploads/1/3/4/6/134635596/1d6dc40f88b55.pdfIn PDF document text
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/wosiju-tezumazov-kikikesan-kunafobukakut.pdfIn PDF document text
    • https://felupujefokedab.weebly.com/uploads/1/3/4/6/134621420/bodemu.pdfIn PDF document text
    • https://wajutuba.weebly.com/uploads/1/3/4/6/134656264/rafoveto.pdfIn PDF document text
    • https://birivuben.weebly.com/uploads/1/3/4/6/134618962/fipodefof-wugaliwofi.pdfIn PDF document text
    • https://virubavu.weebly.com/uploads/1/3/4/7/134755547/jaganolefuf.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/3004651.pdfIn PDF document text
    • https://gazelavulokar.weebly.com/uploads/1/3/4/2/134265358/4636673.pdfIn PDF document text
    • https://rilemiwekeb.weebly.com/uploads/1/3/4/5/134599700/3365ad033d14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369333/normal_5fc8e558d8868.pdfIn PDF document text
    • https://sorasewemo.weebly.com/uploads/1/3/4/3/134358680/xazegafere.pdfIn PDF document text
    • https://fujimerikav.weebly.com/uploads/1/3/4/3/134307110/bununamigiso.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

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_off0000b7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CE 4896 bytes
SHA-256: 7031f23d7623ba1c6725a6a5d0c1a1bc9e43640b5fb39e91e86a4ff15d39e594
font_01_sfnt_off0000c88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88A 9500 bytes
SHA-256: 7d978ebbb9f694800004ff2b14d3e4710c034852b6ba66462e59e178cb32d329

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