Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ca7b7a8c82d5cd…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 20:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a89cf992effca9192111ba78e912759e SHA-1: 596758400326480fea0650b47d99817a84ba8112 SHA-256: 41ca7b7a8c82d5cd1556885143965010d5ef3d9a882d0b6eb6aabbdbbf368e58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=gta+sa+damon+ps2
    • http://savitaco.com/uploads/images/files/26843516790.pdf
    • https://nhahangphongcanh.com/uploads/files/lamunerunomomonekaviwus.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309554b2c6f---88296357972.pdf
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zaguvefogokuniv.pdf
    • https://dianthusindustrial.com/resimler/files/70982000076.pdf
    • http://slsnn.ru/content/files/madanowibetogobininaba.pdf
    • http://davcpundri.com/css/file/zepaf.pdf
    • http://cee1968.com/ckfinder/userfiles/files/79072664275.pdf
    • http://primethailand.com/ckfinder/userfiles/files/nonexipe.pdf
    • http://betonkeritesek.eu/Content/files/93213740133.pdf
    • https://onecre.com/images/content/files/19570560103.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6b4302e35---semugipuzokapusexaxe.pdf
    • http://celyroknaterase.sk/editor_uploads/system/files/bakisuwedawibofej.pdf
    • http://elmbbq.com/uploads/files/dibosuwipomuviketetega.pdf
    • http://kangmeideyiliao.com/uploadfile/file///2021090507513754.pdf
    • http://whkmradio.com/userfiles/file/78783691975.pdf
    • https://propiedades.net/ckfinder/userfiles/files/59588583705.pdf
    • https://daulte.ch/ckfinder/userfiles/files/73727244604.pdf
    • https://zilalcooling.com/other_files/File/52648885276.pdf
    • http://otestmanager.com/club/data/userfiles/file/20210911144250.pdf
    • http://imailbox.nl/images/uploadedimages/file/288560338.pdf
    • https://yodishit.com/uploads/userfiles/file/sobedojaxen.pdf
    • http://twtipa.com/upfile/files/2021/09/09/38545326351.pdf
    • https://vaitinhdien.com/app/webroot/upload/files/befokosakaw.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_off0000dcd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD5 16792 bytes
font_01_sfnt_off0000f4e7.bin
0ec0b0b98748afbc6ea7f375b92901127f93e36a2f1749d7d7369acd1d9234cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 20004 bytes
font_02_sfnt_off00012a09.bin
a4b3c3bcd5a59d2f8aac048d65c821e387cd4e5fae52ca34b796ea90e72e2203		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A09 10344 bytes

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