Malicious PDF — malware analysis report

Static analysis result for SHA-256 935b7fae13981b0b…

MALICIOUS

PDF

68.0 KB Created: 2021-09-26 04:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c059c4540d67cff840a2f80d0c6686a3 SHA-1: 65c08a56bce4e5f97487c97a990b800a0209d3de SHA-256: 935b7fae13981b0b9d4bfc8901ca215ef696608ee0f3d4b0eb58cb8c5f542668
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to redirect users, likely to phishing sites or to download further malware. The presence of numerous embedded URLs, many pointing to potentially disposable domains, reinforces this assessment. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://minlinart.com/archive/upload/files/matufusazirozor.pdf In PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/zusinasojosamuled.pdfIn PDF document text
    • http://gerocuki.hu/user/file/98227638019.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/31139116148.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/64145052442.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210921_C9537386EABB78D4.pdfIn PDF document text
    • http://micruts.org/userfiles/file/tupilitekawubavaja.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/kasiru.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/62245815471.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/lobab.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/30866240140.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/fimulafidetujudemekiw.pdfIn PDF document text
    • http://3q1p.com/upload/file/2109172113180915012pyabjf7v1ja.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/pejifobamoxarodig.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/59877537038.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2b04a26a0f50b93a9d50d530d27338f5/toxusobibopib.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/39069102708.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/jubuxiwalomozejekuveji.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/87068389289.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/6901050970.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210923224419.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/lufakarunixabebumuruwofe.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/desudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=among+us+game+onlinePDF 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_off0000ad88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59A 14948 bytes
SHA-256: c1630c0260cff480f6407d3dd2c30d8da5356cfb9134b5dfee6a933658370474
font_02_sfnt_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 10332 bytes
SHA-256: 04742363f57589d83a1733f20edab03572d5440a5b9b39239e7afa7af6552df5