Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9a1b3aee6bee4c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 12:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f5881e63d1347b60c1c91cc9ba9cd5f0 SHA-1: ed2a98cd4b552aa3aa9eea83de61ec6dacbde8c3 SHA-256: 3f9a1b3aee6bee4ce8bcfc1135c7b29cb81deb3aae99eceae3d6a62947ceea7d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to direct users to potentially harmful sites. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=good+words+beginning+with+k PDF link annotation
    • http://zamgph.com/uploads/file/021145448708.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/sepozibamozamurefebefef.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/fufewasob.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/59759167949.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/pusazifefematobi.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/28500973202.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/28889918676.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/45408284463.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/natenebodezofi.pdfIn PDF document text
    • http://annabarons.com/files/files/78940761351.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/wodosefowigegelo.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/boxotuvenoxifibi.pdfIn PDF document text
    • http://kelsenator.com/userimages/kanojifipofarudageke.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/73425598781.pdfIn PDF document text
    • https://micsys.in/userfiles/file/kifonolagelaron.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/ravidaseduj.pdfIn PDF document text
    • http://pactolous.hu/upload/file/tanamuwipuwakepatog.pdfIn PDF document text
    • http://sakem.org/userfiles/files/tewexi.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/74561480642.pdfIn PDF document text
    • https://tl-systems.hu/files/files/kofizipek.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/89451866102.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109060718238988.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/jigus.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/56209041028.pdfPDF link annotation
    • http://yujinpharma.com/upload/files/17697428169.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_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 17340 bytes
SHA-256: e96dccf68729c4900f5ebfe3a2b0e2c7bd8d9e87a391bc32678af44684b47ece
font_02_sfnt_off00012152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12152 10676 bytes
SHA-256: e77e7c7704b2bdcbd090a77647b960572ea6590c306a8ff05aee9c92751b78ca