Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62e1d89970f84b1…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 12:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 120ca6beb6a56b32df697f80eee99f02 SHA-1: 3bcdfbae0f708deb5c58b7c277e3a533c4db8d40 SHA-256: f62e1d89970f84b197ac773438665bf2e39727949c9c6ac439de095930b2190b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is used to distribute links to disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://alkoplast.rs/files/31356007423.pdf In PDF document text
    • http://www.bash.cl/media/file/lomafi.pdfIn PDF document text
    • https://epiphanych.com/images/file/80116724490.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210908_728067B2F8E510B4.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/kikixa.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/nesovujegosobebugimakafaw.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/jubasow.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/42410452061.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/sitibagejer.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/1729197403.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/78543624989.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/dulefopol.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/kuwuxikaketigomiko.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/sagumetepikukeziga.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f55781bb39---basajufituturuzixigevel.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/58083151000.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/6478366545.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/xifubawikipalu.pdfIn PDF document text
    • https://aitalk.vn/upload/files/17209141493.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/fagenod.pdfIn PDF document text
    • http://theponghop.com/upload/files/27292828230.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/23158195660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=march+android+update+2021PDF 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_off0000d727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 10784 bytes
SHA-256: bd7775ff25273abb25a82c41bebba090e8cd56b2cc2d577abf0405a3140da061
font_02_sfnt_off00010816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10816 18084 bytes
SHA-256: dbe3b4b432e6bb97edc67675e7c760cf37bf8ccf4e47874c2462826ff13b16f1

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