Malicious PDF — malware analysis report

Static analysis result for SHA-256 a591a42d7ce01dd1…

MALICIOUS

PDF

71.8 KB Created: 2020-12-04 00:55:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 01ec9dc28bdcd020dfc40fa8173d53f3 SHA-1: d884c17bc3ed18b487b49f8761556995b7f6e5fe SHA-256: a591a42d7ce01dd1ff2f6ccbc2931613147c6707cb1af28a7da6630bad16748f
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://traffking.ru/123?utm_term=chemistry+conversion+chart PDF link annotation
    • https://kaxokotul.weebly.com/uploads/1/3/4/3/134380066/vaxepud.pdfIn PDF document text
    • https://zupavuzinopaz.weebly.com/uploads/1/3/4/2/134265708/4530732.pdfIn PDF document text
    • https://vatipasa.weebly.com/uploads/1/3/0/7/130775610/554b59bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5f8dbaf31e92f.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/tumusora_perorig_kugiso.pdfIn PDF document text
    • https://sanawovixib.weebly.com/uploads/1/3/4/6/134653903/68da29eff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_5fb29e506b511.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/tireluvosalerovuj.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/9edd6df0.pdfIn PDF document text
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/54f5e0bc66671e9.pdfIn PDF document text
    • https://wugovokida.weebly.com/uploads/1/3/4/3/134319073/ginuzadibaje-zedeve-kedobem-dejun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/desenaz/jopovaxogu.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_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 5072 bytes
SHA-256: 1eca500b9a1dec355df9cea7619ad464288e3247aaab171ac2533c1c1f9b600d
font_01_sfnt_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 11380 bytes
SHA-256: 82272e20dbc46c1ccef783df9ddc8cee3e77db34f356a96943264293d49cd684

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