Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3c613c64a13a34…

MALICIOUS

PDF

49.4 KB Authoring application: Smallpdf Desktop
MD5: a7dfd9329010fd9b799fc22a0525f42b SHA-1: 7ca8df6b9cee9c0c0b4cd154c2761076abd3402d SHA-256: 6d3c613c64a13a34123609b4b317945de1f8941d07f941b5358b3d534c0db5ca
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, pointing to various PDF files and HTML pages. The document body mentions 'Myspanishlab extra practice answers', suggesting a lure to disguise the malicious intent. ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9775

Heuristics 3

  • 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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://wildhorsesanctuary.net/uploads/1/3/0/7/130740456/kovolapizanisen_sabikujutiveme.pdf
    • http://zafimozet.mygreenpoint.ru/uploads/2020/01/28/7cdb9aab6322d86.pdf
    • http://microtiasurgery.net/uploads/1/3/0/4/130489230/migetedulosobu-kotifinuwam-jelupokufadidab-gejotuzipomaba.pdf
    • http://chewoncakes.com/uploads/1/3/0/6/130605248/130605248.html#myspanishlab+extra+practice+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ba0.bin
b264da475a57ad0a8fc0080af0a9dc7683bc9f987a321c3927a45af8ac05f059		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2BA0 16928 bytes
font_01_sfnt_off00004706.bin
c5c63bcfc3f6ddbdf508b7d6a6977eb5561879e3be342fb9a945a70c1e04963c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4706 10388 bytes
font_02_sfnt_off00008af7.bin
8e46485b65c4c251fc8d217c8c5f722985f354f06824988eb18930027017e028		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF7 2732 bytes

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