Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e5661772b5df25…

MALICIOUS

PDF

91.0 KB Created: 2021-09-21 06:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea0928b618855f0c3f12b6c92e9c7171 SHA-1: 37bd5dd828a13c9b3c2ebb3820817d4ea44ba1ed SHA-256: 79e5661772b5df25e8e76eabef958f6016de4f651bd845c3fc9e4fbd3b09321a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. The presence of a link farm and external URIs points towards users being directed to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://kcemsp.org/upload/editor/file/59008948483.pdf
    • https://htapigroup3.com/contents/files/90320224132.pdf
    • http://kartinatv.org/uploads/files/ximujuruwigawaxavuto.pdf
    • https://sonntag-immobilien.lu/userfiles/files/miludelodeduk.pdf
    • http://eco-building.cz/UserFiles/File/bobapedonetixunakutapot.pdf
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/gutok.pdf
    • https://transmar.biz/ckfinder/userfiles/files/wijalujajamob.pdf
    • http://naplesredeals.com/userfiles/files/70603584368.pdf
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16763041973.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/sodozuj.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/resigileletitomumusek.pdf
    • http://mojahotels.com/ckfinder/userfiles/files/12910198124.pdf
    • https://maytinhdalat.vn/images/uploads/files/97540708801.pdf
    • http://sgpeo.pl/users/file/54489373129.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1ccfb3e59d05d2c5a41145cb15d12ec3/65271830746.pdf
    • http://candemdientu.com/Images_upload/files/tojawopuvepuwakasivunewu.pdf
    • http://kamerton.nl/clientfiles/83933597717.pdf
    • http://edituj.cz/res/file/82132571924.pdf
    • http://ulrike-mayer.de/userfiles/files/bemojozutobad.pdf
    • https://loyalangkorapartment.com/userfiles/file/benaditaxigodudasage.pdf
    • http://nprofit.hk/userfiles/31569329694.pdf
    • http://ukrkarta.ua/fckeditor/userfiles/file/74839554405.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=wrath+of+man+1080p
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/jewugukiz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 16792 bytes
font_01_sfnt_off00010cd7.bin
c4f0199a33be8a6bb2365de49c793115dce4128d3fbf7e6ba481f4816f2dfeca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD7 21816 bytes
font_02_sfnt_off000146a5.bin
50bfcd5fdeb8d193845e838b257d1d55d0e7ab0838c2271617e77615c07bb141		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146A5 10560 bytes

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