Malicious PDF — malware analysis report

Static analysis result for SHA-256 602b523bb7c009ee…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 14:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1f4a40ce9eb9a43d3163aeacd5d6079 SHA-1: ac662339d51f6e39104e9f60aa707cbdae3bee04 SHA-256: 602b523bb7c009eef3e2a511343c7e226cd819126bbccd16120e50504d9ae0a8
126 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=android+internet+access PDF link annotation
    • http://icsbc.ru/fuploader/file/95393754335.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/11773072352.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/73132760860.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/jazurukebovezep.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/nafisoliri.pdfIn PDF document text
    • http://rilta.net/userfiles/files/53604495669.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/50509299985.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/kakopeliwalesigarateg.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/pavugobamedejitilukuzapem.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163109764194899660453.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/vebavisoxagolow.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/tevobejomajizexupunezogof.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161425df0d88e5---kavedonowamirodefu.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57685125431.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/pijakaluwejizokaxekelixaj.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xolepowodevodabem.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/farimuwipuwunupop.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/21804978789.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/soladoresi.pdfIn PDF document text
    • https://websbag.com/uploads/files/poludimedomuro.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/28797200711.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_off0000d2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D9 17524 bytes
SHA-256: 3c8a65ee010f3119049ecbf0773825c829b7e68651749c5bdfd1ace6a1b8c736
font_01_sfnt_off00010104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001191b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191B 10296 bytes
SHA-256: 01c5c1429dd0347d7cced296420cf36bd177647a59da5fa3a88b62d2f7a49227

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