Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd1b8f575da5da1…

MALICIOUS

PDF

69.3 KB Created: 2021-09-18 03:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c61f7044380e39851103b185f20c9cdf SHA-1: 401ca9e3e29ca67811b8497fdbe991bf6dcc0e00 SHA-256: 7dd1b8f575da5da1ce39fa3c4d2d89b5a53f7000654e3b01624f51f2b7fd10c3
124 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating it contains malicious content. The PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains. This suggests an attempt to manipulate search engine results or distribute further malicious content. The presence of external URIs and the overall structure point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7457

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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 http://tmkb.org.tr/ckfinder/userfiles/files/12077042064.pdf In PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/84203177999.pdfIn PDF document text
    • http://webursitet.org/Files/file/kabes.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/garejuxep.pdfIn PDF document text
    • http://dfanchem.com/upload/files/98652677772.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/zajawadigovubegibakef.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/69434665891.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/93374563696.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/52449206667.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/93245310320.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/videmirovanajusebuvep.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/18750237000.pdfIn PDF document text
    • https://ccskin.com/geektic/files/76676395495.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-10/20210910021540538641.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/nuligevutif.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/73789051932.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/48111621003.pdfIn PDF document text
    • https://tmtteks.com/files/33252554028.pdfIn PDF document text
    • http://urology-andrology.com/userfiles/file/xalinikubifuduwaze.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/63592963567.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/kipanezuvilezarow.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16308030797421.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/lexapizot.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/18278179062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+many+calories+is+a+mcflurryPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 10688 bytes
SHA-256: 32d70c44b44968588860cf9bfdd4acb9b9bfcfeeea57e4ac607680d8c6c5bda1
font_01_sfnt_off0000ec02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 18476 bytes
SHA-256: 377d4facb215379eadc89c5804b3dedd66a15cf309ddec821c06ee6e9d30ed6b

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