Malicious PDF — malware analysis report

Static analysis result for SHA-256 1495cc2541235913…

MALICIOUS

PDF

38.0 KB Authoring application: Smallpdf Desktop
MD5: fbe5111dabab154d10f114e9ac21dfc4 SHA-1: 88d32f10a9e56efe97a72f01d7532007a3860f17 SHA-256: 1495cc254123591368335300f320fc5a2d06c3f53f612e7d9308dd73436cb606
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to external PDF files hosted on various domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious payloads. The ClamAV detection and ML classifier strongly suggest malicious intent, aligning with the PDF_SEO_LINK_FARM heuristic.

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 https://sanipinupo.weebly.com/uploads/1/3/0/5/130539042/570b269.pdf
    • http://tunbridgewellsu3atrial.weebly.com/uploads/1/3/0/6/130620807/14946285c0.pdf
    • http://belgianundergroundbrewing.com/uploads/1/3/0/6/130604625/fabimib.pdf
    • http://naka-g.creps-inc.jp/uploads/1/3/0/4/130435939/4671343.pdf
    • http://johnaadams.com/uploads/1/3/0/6/130605198/04e71.pdf
    • http://mitdynamit.weebly.com/uploads/1/3/0/6/130604566/xigemotu.pdf
    • http://onlinehelp-myaccount.net/uploads/2020/01/27/1741399.pdf
    • http://theacneandskincareclinic.com/uploads/1/3/0/4/130483355/3cc9519a.pdf
    • http://jex.philmi.ru/uploads/2020/01/28/xadoxerupo_nulodafadorav_xexakutekolag_wujaxomogex.pdf
    • http://richarddominickent.com/uploads/1/3/0/4/130488839/5460385.pdf
    • http://traderhsm.com/uploads/1/3/0/6/130639642/040538d78.pdf
    • http://zumij.flewka.ru/uploads/2020/01/27/fopapimejaror.pdf
    • http://theperfectaccessory.org/uploads/1/3/0/2/130289543/zemuwivuxukatib-kefaveka-tekigakejuj.pdf
    • http://nuobeijinghotel-chinese.devsite-1.com/uploads/1/3/0/3/130323196/130323196.html#dynamite+prophet+sport+lipo+charger

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000013dc.bin
7805e753cb07d571aff544e3f0345afed55b94cd080fd5035ae7acff6f6818c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC 8544 bytes

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