Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e4527a759fc0e6…

MALICIOUS

PDF

73.6 KB Created: 2021-01-24 18:08:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 587a1b82311ecd4742e253280efe4829 SHA-1: c09baa7340ccc1c8bd37e326730cbaf65f6ccfc0 SHA-256: a2e4527a759fc0e6a2b602d55f87eba2fe6f8b97e4c296727643d6e219c437a7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While 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 5

  • 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 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://maypoin.ru/123?utm_term=idaho+car+seat+laws PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416653/normal_600c528a30bf6.pdfIn PDF document text
    • http://dasuwupozu.22web.org/wudejirirafonof.pdfIn PDF document text
    • http://zavudonalu.66ghz.com/installment_sales_contract_on_credit_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425726/normal_5ffb1a0a4ac81.pdfIn PDF document text
    • http://pitupunum.iblogger.org/synthesized_and_inherited_attributes.pdfIn PDF document text
    • http://minomesiguziv.22web.org/rimiwamekuboxudaj.pdfIn PDF document text
    • http://rabejagoruwobol.66ghz.com/meme_templates_tamil_hd.pdfIn PDF document text
    • https://jegobagugixados.weebly.com/uploads/1/3/4/8/134858953/9351ed5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_5fd1a926e8078.pdfIn PDF document text
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/zazenu_fevujina.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/5064255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447669/normal_600b5f9d11441.pdfIn PDF document text
    • https://cdn.sqhk.co/diwiporeb/hapOjhn/87074905374.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sobibuxasegisun.rf.gd/7445897294.pdfIn PDF document text
    • http://tisudaxutuz.epizy.com/angular_formbuilder_set_default_value.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_off0000e382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE382 5056 bytes
SHA-256: ee209736195254f75587188092c4c76e4685e4fe6fac995147a38b123ca2758c
font_01_sfnt_off0000f4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 10836 bytes
SHA-256: cb2c4108fc88659494ea8265bdf96bd51bb6ed8b5757eb1c4333bdd2795a64b8

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