Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b2e72b01a7fb5d…

MALICIOUS

PDF

72.9 KB Created: 2021-09-26 10:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d78bbe05ec18e3eb1c2a0a28bfb0c04e SHA-1: d5cfced2e9f0d33b52ab2e816780c8308ae2e74c SHA-256: 07b2e72b01a7fb5dfe55e1b6e63c45ea568a719cb052baf85223e8cdd49b06c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct hosts, with one URL identified as potentially disposable. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nolimitscenter.be/peausitive/images/FCKeditor/file/44298518945.pdf In PDF document text
    • http://fsoa.cn/userfiles/file/81907089297.pdfIn PDF document text
    • https://duel.pl/userfiles/file/roxod.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8b6a9c4d6f3c150b90ce2e1103f5e597/kagexuwefumun.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/bobojebuk.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/fumatetawas.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/84981682457.pdfIn PDF document text
    • https://kimcert.org/E/file/56426244127.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/darulelela.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/61873114689.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/wumexog.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/55041070448.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/torinira.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/78859200142.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/gemija.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/jogevufuxususigevavomen.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/zosukufagolow.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/dibupoxumelomolejomum.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/3dbac6a5ed7b0e26e19b2a1b6a4049ac/juvekosuw.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/42099780817.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/toxuveburixasuponurodu.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/35818702107.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/sazegabadibud.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/14864604981.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/gejupebeduribojabipija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=aldiko+book+reader+premiumPDF 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_off0000b92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92F 10496 bytes
SHA-256: 9f4b0cbf517f3cac11b10ccb9a2f07a28ea0117e84bd57f7b70259dac5f98820
font_01_sfnt_off0000d0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BD 17384 bytes
SHA-256: fc2862d67e6683dc0cc6efe64db7ff0732e8cb6bd26eeb976cb95f4ac4579831
font_02_sfnt_off0000fd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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