Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b92f4e0e983a78…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 10:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 146efae406d176940a4839fe9df8e8ad SHA-1: 75c3c28359a397ea63dd987ed34c0f8d319356c7 SHA-256: 34b92f4e0e983a7856b5fa1954ecfc0b1b8d2e22da19ddf780b04fc73de3b427
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, with a high risk score. It contains numerous external URLs, many of which appear to be part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded content indicate it's intended to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://infrive.ru/uplcv?utm_term=django+by+example+3+pdf PDF link annotation
    • http://rintoyo.com/userfiles/file/58211207566.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/79159081859.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c9b382f9d---dimetozaxifisapixir.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/kakujutufiwesinos.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/202192147288070.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/39046322874.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/24678609592.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/25817327611.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/99451096016.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/47520657925.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/difelasedowejoxan.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/10113533179.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/badinafusapozopugujodebu.pdfIn PDF document text
    • http://klaaswester.nl/img/file/wabeni.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/42496569127.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/jopetoninevini.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/5111478618.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/zulikofuxeto.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/kimigaxulidim.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/43318679697.pdfIn PDF document text
    • http://szm.hu/userfiles/file/xejexegodok.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109181501122434.pdfIn PDF document text
    • 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_off0000ac0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC0D 15260 bytes
SHA-256: 7aed2278fade94a45b5a6da188a2b2e320218ae2192ec3df559d4cabf6cc261c
font_01_sfnt_off0000d2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 11044 bytes
SHA-256: 4aada6f11bc7a0e076d2d8766a692a16c240316aed6e26a2b9bd55051dbc754f

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