Malicious PDF — malware analysis report

Static analysis result for SHA-256 36102126682de999…

MALICIOUS

PDF

74.3 KB Created: 2021-08-18 12:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f054ae1c566f9fd2adae47894cb5a68 SHA-1: b3d286eafe2f0f155f1049fa0d626d5a5e6c0733 SHA-256: 36102126682de999a32e3fcee7ade68a3501564095b0fc608b99ac21fb979272
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to disposable hosting, suggesting a link farm designed to obscure the true destination or distribute malware. While no scripts were explicitly extracted, the nature of the PDF and the embedded links suggest it is intended to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fablab808.com/nbloom/fckuploads/file/nefokafezebozize.pdf In PDF document text
    • http://pi-consulting.ch/download/41755391343.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/wewodasupumifez.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/37865733313.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d822d2319ee---21132365959.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/zaxomuzubezuzorufog.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/27361170818.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/zapof.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/kunoxu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e02b27b7db3e5761f4c12e4d3077fd89/dowanevek.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-27/20210727042331214208.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/86753123594.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/gapusakaferoli.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/51743227068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sinopse+do+filme+maze+runner+correr+ou+morrerPDF 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_off0000b936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14D 10920 bytes
SHA-256: b51525aeed25614b7531e67a0df1b7bf91468986f73f31854b3b748338af1544
font_02_sfnt_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 19308 bytes
SHA-256: d9e18a4d4ba4bda7c68cf403e82652126cc1d3b5fadd24615029efd12a56cee4

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