Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63f049b6ed9c09c…

MALICIOUS

PDF

72.9 KB Created: 2021-02-04 05:08:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: be2c41ad64fc69e4166c73f59f3343a2 SHA-1: 6b03d11382508b5667d7d91fbb8fd610fab1d6a3 SHA-256: d63f049b6ed9c09c2a5321a13a45fdd86b111398e2db30046a199dc1ab60269d
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://crophysi.ru/aws?utm_term=salvado+de+arroz+informacion+nutricional PDF link annotation
    • https://xopozutafedas.weebly.com/uploads/1/3/1/4/131453480/3003085.pdfIn PDF document text
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/f68159686b150.pdfIn PDF document text
    • https://wetugaremuzen.weebly.com/uploads/1/3/5/2/135298520/1480f2ab12fc.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwexosul/eEiNfjc/rugisidejop.pdfIn PDF document text
    • https://rulakufip.weebly.com/uploads/1/3/4/4/134489053/56de7.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/hhcgeii/cardboard_bunny_castle_diy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470981/normal_5fd0e4816485e.pdfIn PDF document text
    • https://mipixapotorifa.weebly.com/uploads/1/3/0/9/130969355/zakewukanexumusav.pdfIn PDF document text
    • https://lorebanoga.weebly.com/uploads/1/3/0/7/130738704/daxakekop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485318/normal_5ff2b4847d128.pdfIn PDF document text
    • https://tukuboxux.weebly.com/uploads/1/3/4/5/134510407/3020025.pdfIn PDF document text
    • https://wibawamo.weebly.com/uploads/1/3/1/3/131383294/xiluxa-diboguvozekejo-gokupususugoju-zojudupu.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/kofabube/77371332256.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/66627982129.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/wunerasanenaxux.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_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 5200 bytes
SHA-256: 74ba6dd3396c49d1197b6962489b9a50e36deb4d8a403d3e81934696565b2e36
font_01_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 11388 bytes
SHA-256: af96fcf243da579676ce99d57e24d3ef05bdbb879f30e047f712a825c102bf06

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