Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d01a6eea6da80b…

MALICIOUS

PDF

86.0 KB Created: 2021-10-17 10:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4db10a000eaa01a7d073b0bc9bc91021 SHA-1: af2f2260bc6f471f33a18304508a6c1b180798d5 SHA-256: 18d01a6eea6da80b12723798ea65832fe1e4d8d3295e9a596f0617fe1510fc05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to a large number of distinct, potentially disposable domains, suggesting a link farm designed to obscure the true destination or spread malicious content. While no scripts were explicitly extracted, the nature of the PDF and the link farm heuristic strongly suggest an attempt to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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 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 http://barsugo.com/ckfinder/userfiles/files/volemowu.pdf In PDF document text
    • http://marta-galan.com/files/varios/file/23667997290.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/3557975525.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/69787938274.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/fakodozisana.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/xujolegi.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/553ht1u7diq00ilgootg06f0sm/45768753877.pdfIn PDF document text
    • http://wsm.hk/images/files/47842299432.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/kovusorajesevorererelix.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/sikedaka.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/mexiko.pdfIn PDF document text
    • http://lacgl.org/upload/editor/file/burudogakirimitomika.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/migevegalolinaxudogasajob.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/961736224.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/20096761676.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20211016092911.pdfIn PDF document text
    • https://duvanco.be/docs/files/10728138959.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/42473325054.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/kukivi.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/zinojigotefumatugu.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/gipofefev.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/nafokozirotapir.pdfIn PDF document text
    • http://yepuco.com/uploads/files/suwuwova.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/sexamowejositeb.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/tgwjJlsMqHc/uplcv?utm_term=what+does+pelota+mean+in+spanishPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 24216 bytes
SHA-256: afc38a6435f3fa25d3088f05daadef1a53fb92d7adfc4c0eed6c67c79721a084
font_01_sfnt_off00011a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A42 10548 bytes
SHA-256: 08814b7b00d4e7bed98df43ac2ac3b6678d3e5a11e273d2bc3e8880db7e80144
font_02_sfnt_off0001321c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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