Malicious PDF — malware analysis report

Static analysis result for SHA-256 254905aa37a57904…

MALICIOUS

PDF

56.8 KB Authoring application: pstoedit
MD5: b7a178530625e48bbe8eaa5bc6e86b3b SHA-1: adf1cf6f66620b2ab445ad89e4767dbbc62a246b SHA-256: 254905aa37a57904ea3d98ee83f30dd1167ffd9ebecf588c73518fcb63dd9b4c
150 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.TtraffRobotInstall-7605656-0 and a machine learning classifier indicated a high probability of maliciousness. The document body contains a reference to 'Bullying - Acoso Escolar' and embeds a large number of external links to PDF files hosted on various domains. This suggests a link farm or SEO manipulation tactic, potentially used to distribute further malicious content or for phishing purposes.

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://debndaveswedding.com/uploads/1/3/0/5/130588927/4370167.pdf
    • http://kexo.globewebguru.com/uploads/2020/01/29/9524147.pdf
    • http://obxaerialads.com/uploads/1/3/0/5/130543084/vamudevapedonejesu.pdf
    • http://stayhererentals.com/uploads/1/3/0/2/130288775/sudawizamirubiz-xixavinusugu-vozorodavoni.pdf
    • http://okna-alis.ru/uploads/2020/01/28/8f9a3d.pdf
    • http://wizteamwork.com/uploads/1/3/0/5/130541465/48618eb1e9.pdf
    • http://online-wealth-college.com/uploads/1/3/0/7/130739879/vunawogusirejop_jaxiraxolotakam_duxekezifikeji.pdf
    • http://cityonloc.com/uploads/1/3/0/7/130775366/130775366.html#bullying+acoso+escolar+rosa+serrate+pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001292.bin
2b63fdde0ffcb4484ee57f9f15450c57979c17b385e7f0411cc4844cf520994f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1292 10604 bytes
font_01_sfnt_off00009212.bin
0a19d3ec01c2bd5f2da2e654894ff9caac3df97291af1acb5ff150be3e6b34cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9212 18100 bytes

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