Malicious PDF — malware analysis report

Static analysis result for SHA-256 e825e2f7302f5bd8…

MALICIOUS

PDF

70.6 KB Created: 2021-02-27 17:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 24c23df62b4475cc58e08c9497c4157c SHA-1: 07fe55a0affda32c706ba3cedbc55d91a75edd5e SHA-256: e825e2f7302f5bd8ae3053673785fae293f945f82b059dc3eb89260777899149
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 numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=how+to+set+a+howard+miller+clock+model+625-236 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369142/normal_60074f508ba94.pdfIn PDF document text
    • https://digaporabanezaf.weebly.com/uploads/1/3/4/6/134689005/5076781.pdfIn PDF document text
    • https://wemivera.weebly.com/uploads/1/3/4/3/134311686/tinox-pezumixel.pdfIn PDF document text
    • https://pigebatidi.weebly.com/uploads/1/3/1/4/131482999/xagibuxejufi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481424/normal_5ff6ab642831c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470837/normal_601665901a94e.pdfIn PDF document text
    • https://nedixizudunosil.weebly.com/uploads/1/3/1/4/131483200/bobilufobikado.pdfIn PDF document text
    • https://goxejebifebiv.weebly.com/uploads/1/3/2/6/132682819/5415326.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/b8e9455c2110.pdfIn PDF document text
    • https://roserilufelojow.weebly.com/uploads/1/3/1/8/131856860/1604372.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lifarodanudu.rf.gd/what_is_the_jeep_grand_cherokee_overland_package.pdfIn PDF document text
    • http://jimeroxivekafos.epizy.com/27485348702.pdfIn PDF document text
    • http://sisuwexiwidal.epizy.com/lurapidurogojomuz.pdfIn PDF document text
    • http://sobogasitizi.epizy.com/15867716754.pdfIn PDF document text
    • http://vokozebutiri.rf.gd/11904991581.pdfIn PDF document text
    • http://fifomivosa.rf.gd/rotoxibefasexavitabavujax.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_off0000d43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43B 5900 bytes
SHA-256: 63fd4047b14948748244ff12b78f851c39280634dfe72a2c5d577a2b85d50d22
font_01_sfnt_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 10700 bytes
SHA-256: 55c5e06c6820e9e6a7ba9c8496355f608f3599407b65203b43f7e9e3c9aecc73

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