Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb45039bdebe3abf…

MALICIOUS

PDF

104.4 KB Created: 2021-06-01 06:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0605c4ba90ad2984d8db80e74206e37d SHA-1: 19ea6e5a413548f59d63e2ece9b9ecf928afb455 SHA-256: bb45039bdebe3abfb745ec8305771520bdfc3693cd9babe2cd8212995771d793
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, with one prominent URL being `https://druttle.ru/123?utm_term=halo+reach+pc+demo`. This behavior, combined with ClamAV detection as `Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0` and ML classification, strongly suggests a malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure indicates a deliberate attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=halo+reach+pc+demo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454300/normal_601254cc09130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488133/normal_601bfd1317fc7.pdfIn PDF document text
    • https://fasexonepagi.weebly.com/uploads/1/3/0/9/130969542/2994605.pdfIn PDF document text
    • https://rilejaxetikisoj.weebly.com/uploads/1/3/4/3/134391290/258942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_5fd2e9edafa23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476952/normal_60677abcedad6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368493/normal_5fc715a8885a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5fdc5297e8fc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413851/normal_5fc87944c29cc.pdfIn PDF document text
    • https://gisidamuxifa.weebly.com/uploads/1/3/0/7/130775495/32ab40def8e6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460694/normal_5fdc5f52e3bbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387565/normal_604f32c64f04e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451023/normal_600912a75cfbf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xojifot.pbworks.com/f/seginadodimagokigame.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144412041/kulaguwerirulamaxuxegu.pdfIn PDF document text
    • http://wusagem.pbworks.com/w/file/fetch/144439641/2707792681.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/gelawuzudof.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144413265/75249121843.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EED 5096 bytes
SHA-256: cb1258d12dfc9cc489cf00f44fdfa822b9beea03eba672e8d8337f9ff5d145eb
font_01_sfnt_off00017013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17013 10852 bytes
SHA-256: 5fa418c9fc7785788b5ededfe5f2da72cba64015de5a6b9d3f253b8ae648492a

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