Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd2c4627e42ced6…

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 03:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3fe730bf2c644f9da9ca5668967cff36 SHA-1: 0fe022531dd1e1e13b94328a8552752e2615ad3e SHA-256: 3dd2c4627e42ced6baa5bf0a503d8d7474dc8bbce322fc7bef140195aece66ef
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous external URLs pointing to potentially malicious content. The PDF structure and the presence of many distinct hosts suggest an attempt to distribute malware or conduct phishing by redirecting users through a network of sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific lures.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2818

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://weldingportal.it/userfiles/file/29634037758.pdf In PDF document text
    • http://metabolitplus.ru/files/file/mosobuxit.pdfIn PDF document text
    • http://zenithmetals.com/files/magaw.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/gijurusupabim.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/96512994531.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/povuvabixazobijumi.pdfIn PDF document text
    • http://keitbg.com/images/files/40100725745.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/93551856777.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/51781367261.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/8023175479.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/kopilibokoxojaz.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/41785130845.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/kesivolut.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/lorim.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/nawudi.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/dutakezukenarogi.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143dad3d4b29---58395577649.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/mumoneturukokezexen.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/77599102658.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210910124938725.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/pasimuropelotaditimim.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614352956c13f---64597173427.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/feruvabididuwegekasi.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/sepuxewebelorixuvubisitob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=air+combat+androidPDF link annotation
    • 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_off0000c695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC695 10304 bytes
SHA-256: a50fd35d9f6f2723011f5f38bc3234577e512750d81b9f94f4ea54f192c6eb95
font_01_sfnt_off0000ddc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 16072 bytes
SHA-256: ba71aed60dfbbe887a2954c6c9bd082ba6ecdddb013fa6bb23cdff088fd8f1f5

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