Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d1ef9b39bfdc40…

MALICIOUS

PDF

45.1 KB Authoring application: Adobe PDF Library 9.0
MD5: ca30c62a7160706c3a818318c4065934 SHA-1: 20e98bf76059b45703fd14e58216ea2773e6d9b9 SHA-256: 78d1ef9b39bfdc401be15a53423a7852f11e491f7055495cb0ffb85cb5130b76
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or content distribution scheme. The ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output further support malicious intent. While no scripts were explicitly extracted, the heuristic 'PDF_SEO_LINK_FARM' indicates the document's primary function is to redirect users to numerous external PDF files hosted on various domains.

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 http://setka58.com/uploads/2020/01/28/cd9f1a.pdf
    • http://rijegexu.50lutions.net/uploads/2020/01/28/malipuwalu.pdf
    • http://aispng.org/uploads/1/3/0/4/130488779/sezeves.pdf
    • http://nokonegaxi.zichain.pro/uploads/2020/01/28/15274.pdf
    • http://berkeleyfpdocs.com/uploads/1/3/0/2/130288534/zuduwale.pdf
    • http://taoyuan-kite.weebly.com/uploads/1/3/0/5/130588443/xugopupusere_bexirorin_gimifonibebe_weseguniw.pdf
    • http://jo-ocean.com/uploads/1/3/0/2/130272886/0b391eb9bcbe1.pdf
    • http://royaltrainridesrentals.com/uploads/1/3/0/5/130588654/ecb2e.pdf
    • http://javiv.esrabebe.com/uploads/2020/01/27/3359c.pdf
    • https://gozezozara.weebly.com/uploads/1/3/0/5/130551729/pasakolofitotulav.pdf
    • http://bowo.faithmirror.com/uploads/2020/01/27/8471797.pdf
    • https://daxivofe.weebly.com/uploads/1/3/0/4/130488304/zejewowizurag.pdf
    • http://theeldqueen.com/uploads/1/3/0/6/130639616/a45bc1e1b.pdf
    • http://duju.kubrinsk.ru/uploads/2020/01/29/wezugigode_budopalixal.pdf
    • http://mukep.ideastoyou.ru/uploads/2020/01/27/zukuzemaburadoj.pdf
    • http://afaparents.org/uploads/1/3/0/3/130323814/130323814.html#root+browser+classic+pro+apk
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001476.bin
7e5f0ac41258b4a167ebc949ac2b66ac4a7cd6afac300db8bd2c2f83f5ce674e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1476 9236 bytes
font_01_sfnt_off000065b8.bin
7731828a69d0305fe5750e64bd1228f1a5d65b32ba1a59804fe8c447fdbacf91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B8 17380 bytes

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