Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44be0a2fe1e5040…

MALICIOUS

PDF

71.3 KB Created: 2020-12-18 15:33:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 139b01d4b969bfe35a767ba0e259a1b3 SHA-1: 43d11bf2abb88f79287b56ec24b6f2c7bd616d21 SHA-256: a44be0a2fe1e5040e180b6052989d2a4cdad1e013f983d9131659bef24e8ecac
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One of the embedded URIs, 'https://traffnew.ru/strik?utm_term=reef+pure+ro+manual', is likely part of this malicious infrastructure.

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/strik?utm_term=reef+pure+ro+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426088/normal_5f98c31b5bad5.pdfIn PDF document text
    • https://lutenowunag.weebly.com/uploads/1/3/4/6/134627800/7d318cbe.pdfIn PDF document text
    • https://bejulukif.weebly.com/uploads/1/3/4/7/134746679/kuzesetivomi_wezudotirap_suwel.pdfIn PDF document text
    • https://kelipibefis.weebly.com/uploads/1/3/4/5/134500531/10284cb0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464077/normal_5fcc8fbb90e07.pdfIn PDF document text
    • https://gamuzajebi.weebly.com/uploads/1/3/4/4/134481120/kubobelopuk-jumiwu-verogilinubuj-daxud.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/fobufiwajeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f91d5d0d33ce.pdfIn PDF document text
    • https://newomuzupigew.weebly.com/uploads/1/3/4/4/134468212/lafil.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/xumakomowi/95740708680.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/xevemamogelutejawal.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/speak_english_like_an_american_book.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_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 4876 bytes
SHA-256: a1bdcd9723b49bfed63b120af0a853438855b189ae0bda648e434d13fbf5aeda
font_01_sfnt_off0000eb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8A 11064 bytes
SHA-256: a6d0da9156529b21232e9e7c614dc718405aefa47ea02d349e2ff3e25418148a

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