Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef36e876ba54db8…

MALICIOUS

PDF

71.6 KB Created: 2021-09-11 21:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 003fcb8753a5e020e4faaf03e8b129c6 SHA-1: 4f0a743623d6e3e3872a8116029c343ce2cd29d4 SHA-256: 0ef36e876ba54db8b1d15e88334b96bd954f8d0cf01183f424acddf14ef79e5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous external URIs were extracted, many of which are hosted on disposable domains or appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=bad+piggies+hd+2018 PDF link annotation
    • https://catequesisnavarra.org/guiarte_userfiles/files/75078140135.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/kunusotededuwatozidelu.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/sowimitev.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/4710663595.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/wewiku.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/tovojovoxixapelomeramun.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/nawolabive.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/89230603449.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/93640525252.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/vepesotifav.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab91a31688---gedaxa.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/15550583157.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/bigajebotimoxikud.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/49407660164.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/68814124417.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/96144941331.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/50997794161.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/66599997475.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/43639242408.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/45913541152.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/39805481445.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_off0000b42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42C 10756 bytes
SHA-256: 7f1f7d510b82d1777016f2c00a5c9cf95e889932ff57dedffaa0060b2e82dc20
font_01_sfnt_off0000cceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FD 16728 bytes
SHA-256: 39953d8feaad01ce2afe83796d1693e55ee6e0e09f9bb3781f3a3fb7ba0231d0

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