Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c44c3ac4b1bd5e1…

MALICIOUS

PDF

27.7 KB Authoring application: Mobipocket Creator
MD5: ff60530478be8c4db7b67971d65e7c5c SHA-1: ff11fd9b4f04b9b91f8ff430bb471acf362b145b SHA-256: 5c44c3ac4b1bd5e100e0258d17a49f1a0febd8f2690fe97c469b6455c3cbcc92
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule and ClamAV detection for 'Pdf.Phishing.TtraffRobotInstall-7605656-0'. The document body contains obfuscated text and references to '2019 telugu calendar pdf ap download', suggesting a lure. The primary finding is the mass of embedded URLs pointing to external PDF files, indicating a link farm likely used for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://koppsinmalawi.com/uploads/1/3/0/5/130543276/buzajakugin-xomojiwudogas-toxaso-midunanifibeb.pdf
    • http://communitycure.net/uploads/1/3/0/6/130639385/wuzapuwopa_puvugavufe.pdf
    • http://humanizingtheenterprise.com/uploads/1/3/0/4/130494059/zogaputumupovamur.pdf
    • http://daylilygoatfarm.com/uploads/1/3/0/2/130288486/2332452.pdf
    • http://nowaysir.com/uploads/1/3/0/3/130323164/kogirinusifivuv-tomox.pdf
    • http://gemdes.space/uploads/1/3/0/6/130604018/tonom.pdf
    • http://naileddailycom.com/uploads/1/3/0/8/130813797/130813797.html#2019+telugu+calendar+pdf+ap+download

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001103.bin
e1671532b25776f1eb66656627c5b470cbdf61d184c79e0e798992ee0292e085		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1103 7572 bytes

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