Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca35abb8d1e6797…

MALICIOUS

PDF

84.6 KB Created: 2021-09-10 03:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 661cafb77905e4e5c49f356d0a062e54 SHA-1: d39184bedc5efa628609eb1067c1d8e1ddc69245 SHA-256: 3ca35abb8d1e6797230bdd92c4e9028508e44c9cbf5ee54da9084e9cd8255fe4
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to other PDF files, suggesting a distribution network for malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mindatpeace.us/uploads/files/pojiwe.pdf In PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/bajazojigukugomuv.pdfIn PDF document text
    • https://viettrungson.com/media/Files/62454361893.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-2/20210902103434282618.pdfIn PDF document text
    • http://santabruna.cl/upload/file/11626662439.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/fatotonijiwarixekig.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/17738752210.pdfIn PDF document text
    • http://asid.rw/userfiles/file/jadusiwaretinumuga.pdfIn PDF document text
    • http://na3.it/misc/file/tazedizofitotam.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rexefunamuwibukuzunijin.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/tinubuwetutulujefuw.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/85363936703.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/75358093638.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/pokewajosixoput.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/xiwopujuzubi.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/30221598152.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/rosadiwos.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/39153706220.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/55032357170.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/17024067631.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/67474713598.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/67226184004.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/37844973435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ita+streaming+film+gratisPDF 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_off0000e506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 18664 bytes
SHA-256: beba3f748a9595f49f8e974963718d0f9cda5b5bd8bed74aaaf47826795ca2d9
font_01_sfnt_off000115dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 10388 bytes
SHA-256: e5f9464c48f9916a9b660eda1f74d6e40ac2e8433ee471b47ec85a3e57360a85
font_02_sfnt_off00012d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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