Malicious PDF — malware analysis report

Static analysis result for SHA-256 8628761bd1f15206…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 21:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 184919cf8b6d188b7f54ca4a82a525e4 SHA-1: faa98e994386d2c7010f9b4536ec0c0e88316a0b SHA-256: 8628761bd1f152069fb2d4bed7d445295e6ddf3d532d69fa0ad8e92e60411f8f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs and a heuristic identifying it as a link farm on disposable hosting suggests a phishing or malware distribution scheme. No scripts were extracted, but the structure and heuristics point towards exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/65004648273.pdf In PDF document text
    • http://factorycontrolprojects.com/userfiles/file/dedafelavubafejoxaso.pdfIn PDF document text
    • http://houselandia.ru/files/3723092378.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/77245347876.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/mosoberurimipagevolan.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613713c425651---jugevilowirusapef.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/35339502824.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/tobuturitexi.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/58876388408.pdfIn PDF document text
    • http://hadt.vn/upload/files/gipado.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///55595577127.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/zeroponejuteg.pdfIn PDF document text
    • http://kleiberit.ru/files/file/tesumagosaneduk.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/72431646160.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/rurapoge.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/xumaxujoludejudutasunuxak.pdfIn PDF document text
    • https://thietbigas.net/media/files/18489102672.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/kekebafawepibikulakuv.pdfIn PDF document text
    • https://finliz.lt/i/File/luwalesazuzokukefo.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/2f831c6d253ad68d1664f0371378b070/94333248365.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/38564641504.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/98154076703.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/pupemafovizafisubisulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pokemon+fire+red+online+downloadPDF 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_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 17168 bytes
SHA-256: aecf392fd20435ee61b8cb9fc08e2928a48ef13534fd3afdaff95b2a3079c640
font_01_sfnt_off00010b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12356 10428 bytes
SHA-256: b7faec3d6fc9d0dcaadc91db2f6b453e5b161efc5abb01b71ea16c27f28b0679

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