Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfc31ef72aed223…

MALICIOUS

PDF

78.1 KB Created: 2021-09-22 10:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ecd59c2710ed6d7de29daaf696ca57a5 SHA-1: 50015ef8876d23bbe6c7eb4ce85ab40e679d7a56 SHA-256: 8cfc31ef72aed2232507e0eeed5b415177d8470c1055e17668682aa6fc853ad8
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and exhibits characteristics of a link farm, with numerous external URIs pointing to various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of distinct hosts and a low number of links per host, suggesting an attempt to distribute malicious content or phish users across many sites. No scripts were extracted, but the presence of many external links implies an intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3586

Heuristics 4

  • 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
  • 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://granitnet.hu/editor_up/xawan.pdf In PDF document text
    • http://byty-pardubice.eu/UserFiles/File/kifurexopunumuki.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210912_22_19_43.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/55982560774.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/59887338126.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/8927670144.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/xulojekiwuvavujasiz.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/tusefatogunober.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161331fcbbe615---gasaxaxapavo.pdfIn PDF document text
    • http://qwerty.pl/_data/file/kufinuzi.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/65537828127.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/gorivapaduneru.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/xeboxux.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/6684229909.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/suxopofidejogi.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/77806396585.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210906192238.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109210508461407.pdfIn PDF document text
    • https://alohasafaris.com/files/gigukafumowogozo.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/7916743166.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/zerokogu.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/62748963657.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/85973480529.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/worekezetawike.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/53765580958.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/daxananejewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+do+a+screenshot+on+a+note+10PDF 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_off0000ed4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4E 18332 bytes
SHA-256: de8e74fd310b120d4c6ea2ac1a06f46b753d149e39178c09aa30d3527a1d50d8
font_01_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1