Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd30db95aa3faa1c…

MALICIOUS

PDF

74.0 KB Created: 2020-12-01 03:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 15bfc5a8f0122aef956565d53e84609d SHA-1: 0b1f9688c6adfe11ff40855ecd2e98788d4d29f3 SHA-256: dd30db95aa3faa1c2f093b0730d888c7fb6e68bf31a8e431eb34fbf349f2b29f
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://trafffi.ru/123?utm_term=nitrogen+ionization+energy PDF link annotation
    • https://xukabasal.weebly.com/uploads/1/3/0/7/130776322/476635b76.pdfIn PDF document text
    • https://siwovipon.weebly.com/uploads/1/3/4/7/134705210/1867881.pdfIn PDF document text
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/4198695.pdfIn PDF document text
    • https://vatewiwep.weebly.com/uploads/1/3/4/4/134482367/jizinatikirakefa.pdfIn PDF document text
    • https://vikesuluwok.weebly.com/uploads/1/3/4/7/134763763/pipebufegufa-talugajik-mikip.pdfIn PDF document text
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/patatujinaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_5f8fcfc6eb9ac.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/zunewidimem/ragamabafenus.pdfIn PDF document text
    • https://s3.amazonaws.com/mewezekilafef/99003967013.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/sql_cast_date_string_format.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_off0000e687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE687 4764 bytes
SHA-256: 62763a33da7bbd8f3c2ed2a5b0b1abfac83d195b8e10d02fe4a84fd2770eb57d
font_01_sfnt_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 10696 bytes
SHA-256: 6843a80d51689db11f27069930a52d5ab689481a478110bf8b19259b44454595

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