Malicious PDF — malware analysis report

Static analysis result for SHA-256 28587cd4f3f29b4c…

MALICIOUS

PDF

27.6 KB Authoring application: Smallpdf Desktop
MD5: 5430bab64b08b1ec4d466bc8315a9853 SHA-1: 775e7793f58644a53607b1726e1a8824c67de281 SHA-256: 28587cd4f3f29b4cb28ce853d7bc572138691a7d5caf6eec1ef8fff35bb70729
160 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common tactic for SEO poisoning to drive traffic to malicious sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document instructs the user on how to open a password-protected archive, suggesting a payload delivery mechanism. ClamAV detection further confirms its malicious nature as 'Pdf.Phishing.TtraffRobotInstall-7605656-0'. The embedded URLs likely lead to the next stage of the attack, potentially a phishing page or malware download.

Heuristics 4

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://mortgagesmart.solutions/uploads/1/3/0/6/130639037/daf7e0ab1.pdf
    • http://stm233.com/uploads/1/3/0/2/130287318/68b4f46cd6b9.pdf
    • http://nancywijnants.com/uploads/1/3/0/6/130621429/9497642.pdf
    • http://principalgneely.com/uploads/1/3/0/6/130605133/63b6d5a4.pdf
    • http://orionharriers.weebly.com/uploads/1/3/0/6/130639941/pefugexi-kuremovemaligof-jegoxebudufow.pdf
    • http://myrocketflow.com/uploads/1/3/0/4/130483817/8751063.pdf
    • http://iconicwatchco.com/uploads/1/3/0/6/130621995/beroterojo_tegitonalun_puvokurixira_pelafosa.pdf
    • http://nobuhotelriyadh-fullsite.devsite-1.com/uploads/1/3/0/3/130313193/130313193.html#paradise+city+tab+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000112f.bin
eb9ff51168daee84d13191661a65303fd2552db08b82e9c466874c9eb9746ede		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112F 7720 bytes

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