Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8c5e6421878430…

MALICIOUS

PDF

36.3 KB Authoring application: Karbon
MD5: bfa56d1348279611e9a44221dbe42c49 SHA-1: 1670044eb5c953ba5e47f94c5ea8db9ba1b79f1a SHA-256: 3e8c5e6421878430c784f56f9ab30807a71153b00079bdc83e6abd9b456b32fc
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 to external PDF files, a technique often used for SEO spam or to distribute malicious content. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier strongly indicate malicious intent. The document body itself is largely unreadable due to encoding issues but contains fragments of URLs consistent with the link farm heuristic.

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://fepu.vipiski-besplatno49.icu/uploads/2020/01/29/zenojesugeso.pdf
    • http://vintagehomecharleston.com/uploads/1/3/0/5/130541402/f72a353aa.pdf
    • http://mysteriesnghostsefiction.com/uploads/1/3/0/5/130551089/b1782.pdf
    • http://justbcosmetics.com/uploads/1/3/0/7/130739780/39470cd0b9.pdf
    • http://thesoftearth.com/uploads/1/3/0/7/130739069/c5f0c61e670e7.pdf
    • http://mododucspiritum.com/uploads/1/3/0/4/130436362/nijejajixa_gizazamape_jesifanenon.pdf
    • http://rebeccaattia.com/uploads/1/3/0/2/130287291/xaduduwufo-renebivalu-desemi.pdf
    • http://trawallaprimary.com/uploads/1/3/0/3/130323466/nobigisudetedil_jugoxabejoratuj_butaga.pdf
    • http://mysearchrealestate.com/uploads/1/3/0/5/130589002/7633237.pdf
    • http://bronline.club/uploads/2020/01/28/fodesekex.pdf
    • http://stormjustice.org/uploads/1/3/0/5/130590374/14ff8c7dd4719.pdf
    • http://adsgroup-wines-food.com/uploads/1/3/0/5/130543837/wusir-dobifu-kogobil-gukupejeroja.pdf
    • http://mgtowtv.com/uploads/1/3/0/7/130738524/130738524.html#edema+pulmonar+agudo+no+cardiogenico+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000138d.bin
ace1f77651a57df81bcb300379c5f32f50a5dd4956e1c8652a2b90c7dfa79698		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138D 8312 bytes

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