Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eda7778ea495236…

MALICIOUS

PDF

62.9 KB Authoring application: LibreOffice
MD5: 031bd2944ff2df2c39ebc75d828050e6 SHA-1: f7e6f981745490c26bba06569518d1645ea00c83 SHA-256: 3eda7778ea4952368bf1eb4c780ae14c8e85ad7b0a18f6f8be53909e329d8554
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to external PDF files, indicative of a link farm or redirection scheme. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the 'PDF_SEO_LINK_FARM' heuristic strongly suggest a phishing or traffic-generation campaign. The document body, while containing text about folic acid, is likely a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bienchulitos.com/uploads/1/3/0/7/130738939/wexanepebulu.pdf
    • http://alternativerecoverysolutions.com/uploads/1/3/0/6/130621467/vuvoxodezepi-norawimi-golejexusufe-kivuduk.pdf
    • http://myplustokenwallet.com/uploads/1/3/0/5/130588716/80bd8f8b0.pdf
    • http://revendainstagram.com/uploads/2020/01/28/dekobamipi.pdf
    • http://rorupunise.wob4000.com/uploads/2020/01/28/2b1398749461663.pdf
    • http://nigella--sativa.com/uploads/1/3/0/4/130435927/40a01af4.pdf
    • http://theheroinesclub.com/uploads/1/3/0/6/130620470/9800183.pdf
    • http://sherryerskine.com/uploads/1/3/0/6/130639745/275663.pdf
    • http://magnificentweedseeds.ca/uploads/1/3/0/2/130291552/6113359.pdf
    • http://drpatty.net/uploads/1/3/0/7/130740356/130740356.html#folic+acid+supplementation+for+prevention+of+neural+tube+defects

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012cd.bin
bcdbfa1b43363b2460172a9d1bed806c3666a9e7002902242d43907219113612		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD 8116 bytes
font_01_sfnt_off0000b044.bin
303c75e1033fa0b3e604bf425b902933612584332b6b7768f0a7da2d20ce4909		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB044 16184 bytes

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