Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66568fe5a87f376…

MALICIOUS

PDF

75.3 KB Created: 2021-02-05 10:29:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 18e77864652313bc30bcfbe392ae7668 SHA-1: d53982613696e93ae2586a4a8472330b4b6ac197 SHA-256: b66568fe5a87f376a8a6b0e84f35c22c09cc42b0de2e5e6e25b0e8f6645c155f
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of a URL with a 'utm_term' parameter further supports the idea of a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/123?utm_term=plural+of+deer+and+sheep PDF link annotation
    • https://cdn.sqhk.co/jemajujo/iM8jgjb/local_flavor_deals_coupons_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413002/normal_5fe93f0da1e4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412380/normal_5fcbab07a077f.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/hftigib/62766998064.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/libros_de_aritmetica_y_algebraorcig.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/NAghr5t/anime_x_wallpaper_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/b7ggidI/63171571145.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/Aijihha/piradi.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/Tf5jcgh/56000512374.pdfIn PDF document text
    • http://anarchymedya.com/vixilowikufogaluneb0ka0.pdfIn PDF document text
    • https://cdn.sqhk.co/wejewenu/nhjihDS/40027300161.pdfIn PDF document text
    • https://sijetiwiriwex.weebly.com/uploads/1/3/2/6/132683168/joxapor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497079/normal_601aa4c96bb3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379973/normal_5fe4d269c0700.pdfIn PDF document text
    • http://olivamebel.com/koberupenotizijdd5.pdfIn PDF document text
    • https://sazagirisama.weebly.com/uploads/1/3/4/5/134585928/2003087.pdfIn PDF document text
    • http://0fruits.space/mubakowonanasadenosurog5dqqf.pdfIn PDF document text
    • https://cdn.sqhk.co/buwowunuras/ioQhaie/scythe_digital_edition_multiplayer.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/gjE23gG/gizenirudovabusube.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/kozewuposoridil/femoxilovelalegeverojol.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/lifeformations_bowling_green_oh_43402.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/xazonozoluwipefubexelixi.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/free_spring_coloring_sheets_for_kindergarten.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_off0000e7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F2 5132 bytes
SHA-256: 2cfe89c515157402ec1c59252d0678ed6eac3f6eea8c2f8fb8f5c89dd1c4b38a
font_01_sfnt_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 10876 bytes
SHA-256: 114e20a7cfbb41adf1dd292de538b8d8d17408ffe2133dc0b7495496a2215b0d

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