Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99b7ade0002cfdd…

MALICIOUS

PDF

39.4 KB Authoring application: Smallpdf Desktop First seen: 2021-10-16
MD5: 9c18087e01a2e8cde378074d78b6953b SHA-1: ed85cbb1259b5e55a9f800fe45596f04a6080332 SHA-256: d99b7ade0002cfdd5ded0745bf94f869c6e2633fdb1127dffe52b1045feeffb3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a phishing or malicious redirection attempt. The document body, though partially corrupted, mentions 'Varices esofagicas tratamiento pdf', likely a lure to disguise the malicious intent. The embedded URLs point to suspicious domains, and the ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall' further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pofcalls-enable.com/uploads/1/3/0/5/130551416/4284904.pdf In PDF document text
    • http://mobile-care.info/uploads/1/3/0/4/130477979/5395499.pdfIn PDF document text
    • http://neighborhoodinvolve.org/uploads/1/3/0/3/130379293/0ec21.pdfIn PDF document text
    • http://xapobunip.uuqqprt.info/uploads/2020/01/29/9977f6f3.pdfIn PDF document text
    • http://basilandwoodie.com/uploads/1/3/0/2/130272909/6646144.pdfIn PDF document text
    • https://golirupo.weebly.com/uploads/1/3/0/4/130476378/1280116.pdfIn PDF document text
    • http://caraboo.co/uploads/1/3/0/3/130379429/ruforol_zanus_lomewep_warerunari.pdfIn PDF document text
    • http://dpaulart.com/uploads/1/3/0/3/130379673/130379673.html#varices+esofagicas+tratamiento+pdfIn PDF document text
    • 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_off000010cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD 7968 bytes
SHA-256: 15b6a177e7357cba0536bda5a86c96774e1840809be7e8002cb0f7852e6d6ecd
font_01_sfnt_off000053a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53A8 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63

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