Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5ed0c426cf5691…

MALICIOUS

PDF

37.8 KB Authoring application: Mobipocket Creator
MD5: 0bc8d9fe367adb478aa659041027fddb SHA-1: c12af8eb45525580a881c5e880f67cf60207bfc4 SHA-256: dc5ed0c426cf5691acd71a8cfb3434920871efd6e664d240f2288b9848ce5707
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to external PDF files, a technique commonly used for SEO poisoning or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to "Dash diet recipes for vegans" and includes the same URLs found in the heuristics, suggesting a lure to potentially malicious content.

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://vinnietoronto.com/uploads/1/3/0/8/130874533/nigekutasefakije.pdf
    • http://centerforpilates.com/uploads/1/3/0/8/130813654/4018951.pdf
    • http://dinuw.rttelekom.online/uploads/2020/01/28/senidusiwolexus_xokiwore_kujudanexurati_wadep.pdf
    • http://millteacher.com/uploads/1/3/0/2/130272280/badudezon.pdf
    • http://bristolberlinvintage.com/uploads/1/3/0/7/130740260/733405.pdf
    • http://wkapparel.com/uploads/1/3/0/6/130640074/fatexovujinet.pdf
    • http://mrsmoothbeatz.com/uploads/1/3/0/7/130776791/e7fa27db2a0948.pdf
    • http://somersetfoodtrail.org/uploads/1/3/0/4/130435745/130435745.html#dash+diet+recipes+for+vegans

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001100.bin
fc13a383360fc043e715b85e5b6de8924ebf9d9b50bdb6ad5b5fd81ac5c81250		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1100 8056 bytes

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