Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8047c13bda4ebc…

MALICIOUS

PDF

85.3 KB Created: 2020-11-17 18:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b063828110c585441b1b7cd58324c794 SHA-1: df4727e652acd1dc7e9ded6ecdd7a33a9e4e4240 SHA-256: af8047c13bda4ebcce21b17b185758c4c99922ea7f7939c91a64f1c1611e6b00
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 0.9997

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://traffnew.ru/123?utm_term=kore+wa+nan+desu+ka+in+japanese PDF link annotation
    • https://musazowoxagaw.weebly.com/uploads/1/3/4/3/134323980/nejaxovuxitonipabir.pdfIn PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/1231916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_5f95246642ff8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369493/normal_5f91a7c367a33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426423/normal_5f9ed8d3e228b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5faae83f85867.pdfIn PDF document text
    • https://tijujuvuxerupuz.weebly.com/uploads/1/3/4/2/134236121/9550092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457318/normal_5faa4ef3dfcbe.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/297624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451376/normal_5fa793a4395c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377933/normal_5fad6d17dc46a.pdfIn PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/5347429.pdfIn PDF document text
    • https://fifevogu.weebly.com/uploads/1/3/4/6/134602809/b8e80b5f325e0.pdfIn PDF document text
    • https://gorokawuse.weebly.com/uploads/1/3/4/4/134489158/9254708.pdfIn PDF document text
    • https://posalezonekat.weebly.com/uploads/1/3/4/6/134628665/javakimumuzagovonadu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 3664 bytes
SHA-256: b7b6a85a8bbcf9df473b45bbab2ba318bd7c196c43abace7f1879eea19bdc807
font_01_sfnt_off00010b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0E 5124 bytes
SHA-256: 4e7d14e097d4f4c2ebc2a671605be9971fad2f8d1fabc3aa25c8330946d2fe25
font_02_sfnt_off00011ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 14764 bytes
SHA-256: a3cc5c83476810a4b6c984c3e729a1546d715069749394db9c1d95117f766167

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