Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a6490d336ab8ea…

MALICIOUS

PDF

33.1 KB Authoring application: OpenOffice Draw
MD5: be33a637c9a3e5ba9f91dc50374971a5 SHA-1: a2990608910fe92d322f98486cd9a0006a613d91 SHA-256: 58a6490d336ab8ea9628dc87f1488dd31c053c3041687649903ac0eb51c8b69c
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO poisoning or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body itself is heavily obfuscated and contains some of the same URLs, reinforcing the idea that the primary function is to redirect the user to malicious content hosted elsewhere.

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://figeduwoj.18xx.fun/uploads/2020/01/28/9425281.pdf
    • http://mugiton.stroyport.info/uploads/2020/01/27/5f2ea3c1917cc1.pdf
    • http://frosting-and-sprinkles.com/uploads/1/3/0/5/130543787/lijikibuxelux.pdf
    • http://dujetul.individ.me/uploads/2020/01/28/a9397065e245f.pdf
    • http://rostelekomrtk.info/uploads/2020/01/27/e1c881.pdf
    • http://fiwewilizu.concepttimecafe.com/uploads/2020/01/28/a86e30.pdf
    • http://xiropixa.a-gward.com/uploads/2020/01/29/3112484.pdf
    • http://ganijo.nhatminhphoto.online/uploads/2020/01/27/lazafitoriw.pdf
    • http://el1t.ru/uploads/2020/01/27/d8fd697.pdf
    • https://tejupixotuzojot.weebly.com/uploads/1/3/0/3/130324248/7c1b3de9ee9b2.pdf
    • http://evokefitness.net/uploads/1/3/0/4/130478123/130478123.html#cheap+thrills+english+song+lyrics

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000124f.bin
652cc243e30ac11ebd5cc2efaae6087bf52d7a7a2f290905c3601e08b80535cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124F 7856 bytes

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