Malicious PDF — malware analysis report

Static analysis result for SHA-256 904dda8bb775c9c3…

MALICIOUS

PDF

84.5 KB Created: 2021-09-14 08:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a863b1b603da6dcfb8ba1b768a807c3 SHA-1: 121707b2ae2895cfa62e991a6cc2429845486c8c SHA-256: 904dda8bb775c9c38da07c017522dcc836672f5dec71f6296e0ea1bae0003d3d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with one URL specifically advertising a 'pdf reader app download apk', suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=pdf+reader+app+download+apk PDF link annotation
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac426a4f3a---kakozafidezuvo.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210907192046832.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/87551429077.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/96521889850.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/56219486806.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/darejodigiw.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/kawasenosoxusofalov.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/labizivoveso.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/mugisifebipovemasufi.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/gaguwizenazuxirakiposeb.pdfIn PDF document text
    • http://thaide.org/userfiles/file/nidavovifabedumajo.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/zuvizuxewezozujuju.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/fasixuwomezosonav.pdfIn PDF document text
    • https://angkagenap.com/contents/files/fizufo.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/10063786230.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/18803865231.pdfIn PDF document text
    • http://imaginove.eu/data/Files/nijokadeligizamufoze.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/nixuwetinefimiwibume.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/loxato.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/rigidose.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/nisavefedutatalim.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/38869097840.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/notop.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_off0000e5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 18304 bytes
SHA-256: 26f33d5a694ea49652e5830a00417d16a6ea2197fe9650e527b0d39f65bd9d11
font_01_sfnt_off00011519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11519 10312 bytes
SHA-256: 4a95e9d7314bed8179f7a53f4b55ade4e9353db1640e198870c029f5956e0afa
font_02_sfnt_off00012c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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