Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff3f1e2b04609cc…

MALICIOUS

PDF

40.4 KB Authoring application: QPDF
MD5: 14ff80ac71e6fbcae73b691615ec7ccc SHA-1: 1d6c574d281baedf3463b8597b39fb116d0dcf62 SHA-256: aff3f1e2b04609cc9182597b680a074d4731ba50b494c19cdc83f6a06927b3a9
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, a technique commonly used for SEO poisoning and phishing lures. The embedded document body text, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to direct users to download other malicious PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://guker.alfasl.info/uploads/2020/01/27/kedin_vobiboram.pdf
    • http://doulakaribirthservices.com/uploads/1/3/0/4/130488286/44772f.pdf
    • http://raj.stroymarketmetal.ru/uploads/2020/01/27/xuvijamikomutewivuk.pdf
    • http://minimebodysculpting.com/uploads/1/3/0/5/130588880/xabov.pdf
    • http://testoimesto.ru/uploads/2020/01/28/rajafomupo.pdf
    • http://mrmacbiblebook2.com/uploads/1/3/0/6/130620300/130620300.html#website+logo+icon

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010a9.bin
2674423f6031cd9dfd443e3a25b436cde5f2cdac08b1c65dc7aaca08a7b991dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9 8884 bytes
font_01_sfnt_off0000551d.bin
ce79088c12419eec9beb441acb5040ce111c525b8f9163952b4b8afa7b974211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x551D 10772 bytes

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