Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f78f600a0db027d…

MALICIOUS

PDF

71.2 KB Created: 2020-11-17 10:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 544e19bfb9ac8adb665fb9871e28925d SHA-1: d3a3f5039ed96b6911dc488a632448c03adec14d SHA-256: 9f78f600a0db027deb4ea9d466621ad9aeec42cd4ada3067862b63a90b7d57c9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

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=mi+primer+beso+libro PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f97426f55981.pdfIn PDF document text
    • https://livabawixegi.weebly.com/uploads/1/3/4/3/134320323/sedozufibalakusa.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/mojuduliwefagud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479916/normal_5fa768e644a98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5f8a16171f4c9.pdfIn PDF document text
    • https://zufuxanibagi.weebly.com/uploads/1/3/4/5/134586570/xozupomipofoped.pdfIn PDF document text
    • https://kozezivu.weebly.com/uploads/1/3/4/4/134444222/sedujorozoxejivubig.pdfIn PDF document text
    • https://wefanuku.weebly.com/uploads/1/3/4/6/134611064/pixud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f895493463b9.pdfIn PDF document text
    • https://rolewexuvuviwu.weebly.com/uploads/1/3/4/7/134742390/vifujokifun_nijifiton_buvus_zekedomomuzupa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_5faa4b43252e8.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/b9f413f0-704f-415c-983e-9c85acd39ade/dukalitokuneminono.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75A 4900 bytes
SHA-256: 961297b4d17e48ceb8d12452adaae000d9c6ba1e6529bcaee44ce494f7413825
font_01_sfnt_off0000c7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E8 1964 bytes
SHA-256: 1d18534733479c870a78c46a90b83ed8aff410c3511f6838c5b83347f92bfa48
font_02_sfnt_off0000d142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD142 11816 bytes
SHA-256: f5c09ef1615e919efcc3195eb448f5985e8a170d7a0d555313b9a26e5d5e4446
font_03_sfnt_off0000f840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 16348 bytes
SHA-256: f08397f94a1e5b3ff15804d951b11f9a4a6cd16f21b5018bfe8355f931477432

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