Malicious PDF — malware analysis report

Static analysis result for SHA-256 860db5a6ebfd318b…

MALICIOUS

PDF

36.5 KB Authoring application: Pdftk
MD5: 5404aa28da320d76ce2c7005a7de920d SHA-1: 937a82d130837d92f109525c313a1ffd8622f04f SHA-256: 860db5a6ebfd318b5cf6d1cc4981124980bd9d3491122df48024096a74be5910
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a mass external link farm, with multiple URLs pointing to other PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The embedded URLs are likely used to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://brugger.weebly.com/uploads/1/3/0/2/130289772/df309.pdf
    • http://stefaniefletcher.com/uploads/1/3/0/4/130475955/8955454.pdf
    • https://nujesusapojedot.weebly.com/uploads/1/3/0/4/130483879/xezopazuxelatovu.pdf
    • https://gakuwuwod.weebly.com/uploads/1/3/0/6/130604441/06fb9ca6c02.pdf
    • http://bonkerforbyram.com/uploads/1/3/0/5/130550774/kewagu.pdf
    • https://wuzosijufereri.weebly.com/uploads/1/3/0/6/130604702/8522111.pdf
    • http://goriteam.xyz/uploads/2020/01/27/005b380f66398.pdf
    • http://manticarchitecture.com/uploads/1/3/0/6/130639591/tetuna.pdf
    • http://contractorsinmalibu.com/uploads/1/3/0/5/130588977/1543.pdf
    • http://betosobo.voskresenje.ru/uploads/2020/01/29/51e2ce61c.pdf
    • http://nobuhotelmarbella.devsite-1.com/uploads/1/3/0/6/130639368/130639368.html#borderlands+3+cross+platform+pc+and+xbox

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001225.bin
d4a5f54682f11853709e2e0cfb5355c0854d9a0786d0552e99883cb68984b9ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1225 8024 bytes

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