Malicious PDF — malware analysis report

Static analysis result for SHA-256 52cf601cb3306772…

MALICIOUS

PDF

82.2 KB Created: 2021-03-02 21:27:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3a6251fbb57fbbbb2953574a7a71f1df SHA-1: 6bb2199663a97eaff26e920fe43681489b882e81 SHA-256: 52cf601cb33067729f65e83edab06fd8b608c66f7561f3943025e4a48eaa17c2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, which is characteristic of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

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://soxebez.ru/strik?utm_term=o%2527reilly+sql+book+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391314/normal_603906ffe21fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488139/normal_5fef3c0155210.pdfIn PDF document text
    • http://bachanalytics.com/mind_map_examples9boj0.pdfIn PDF document text
    • https://kelulove.weebly.com/uploads/1/3/0/7/130775366/lewimokudufefew.pdfIn PDF document text
    • https://ketuvukelese.weebly.com/uploads/1/3/4/3/134351906/235160.pdfIn PDF document text
    • http://idealslimitalia-ufficiale.site/heroes_evolved_mobile_news183q7.pdfIn PDF document text
    • https://denesibupu.weebly.com/uploads/1/3/0/7/130774977/nuvarosakevajid_dufevevava.pdfIn PDF document text
    • http://triple-doska3.club/bassett_crib_instructions94h2s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410030/normal_5ff8ab34e694c.pdfIn PDF document text
    • https://gidorimafemona.weebly.com/uploads/1/3/4/8/134867851/3295250.pdfIn PDF document text
    • http://all-system7.work/69321353388rb3un.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388406/normal_5fcc3e1cb914b.pdfIn PDF document text
    • http://bavedibigilomit.66ghz.com/aines_dosis.pdfIn PDF document text
    • https://gifetapajuloper.weebly.com/uploads/1/3/4/6/134682222/1432507.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/2442744.pdfIn PDF document text
    • http://faceit.su/aprender_ingles_rapido_y_facil_audionjchw.pdfIn PDF document text
    • https://pifujikis.weebly.com/uploads/1/3/4/8/134875168/8060779.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zosonigileg.rf.gd/blank_apothecary_label_template.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_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 5488 bytes
SHA-256: 98c51756ccbf454a4cc981b7cfb055cf0fb548ffb48cf0df0c07478517dfb192
font_01_sfnt_off00011790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11790 10552 bytes
SHA-256: 66a30a7db62f91cd5c932bddd0714f3d957a8816027da0f2e54a2de3045c7c49

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