Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcfaa3c01d28532…

MALICIOUS

PDF

41.9 KB Created: 2020-03-29 15:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 58aac3012947f3530d71571793da0943 SHA-1: 0aba98f91b9e7c1c86e6aef0ef0dcd83d37a404f SHA-256: 0bcfaa3c01d2853203343b28120e67ad6ab7ef63d6e3bcd9f3d6cffa4ed8580e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits a high number of external links, many of which are algorithmically generated and point to other PDFs, indicating a link farm or redirection scheme. The ML classifier strongly identified this PDF as malicious. The embedded URLs and the PDF link farm heuristic suggest the primary goal is to redirect the user to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://peaksviewperk.com/uploads/1/3/0/9/130969355/130969355.html#que+es+partida+doble+en+contabilidad+yahoo
    • http://jettes-sundhedsklinik.dk/uploads/1/3/0/2/130288594/lurek_bigesuj.pdf
    • http://nataliefernadez.com/uploads/1/3/0/5/130589345/nokijumabat.pdf
    • http://daintybug.com/uploads/1/3/0/7/130739278/mudejoxijokuji-zekovogekiz.pdf
    • http://platinumprecisionvirtualsolutions.net/uploads/1/3/0/5/130551041/6b9d6.pdf
    • http://healthandorincome.com/uploads/1/3/0/4/130490386/niwirazutesuk-zojubul-luzunor.pdf
    • http://studyyourwaynz.com/uploads/1/3/1/4/131408832/xezugozinizawe.pdf
    • http://isitsmart.com/uploads/1/3/0/6/130639241/5cd0bfc85eee.pdf
    • http://nirvanaeventlighting.com/uploads/1/3/0/9/130969329/eca748940671.pdf
    • http://docreditcard.com/uploads/1/3/0/6/130621995/lugawenigujas.pdf
    • http://knits4hope.com/uploads/1/3/0/6/130639073/nawobad.pdf
    • http://sanditaplantita.com/uploads/1/3/1/3/131384481/566a1c909f6.pdf
    • http://fivesstones.com/uploads/1/3/0/7/130775049/wixal_gejale.pdf
    • http://plasticspaces.com/uploads/1/3/0/2/130272932/8eb3fda8c.pdf
    • http://ravellence.com/uploads/1/3/0/6/130604576/suwawezawupubufe.pdf
    • http://tjsk9academy.com/uploads/1/3/0/4/130483407/wimilevudafu-rudinot.pdf
    • http://stagesphere.com/uploads/1/3/0/4/130488884/759e841058f114.pdf
    • http://caddelite.ca/uploads/1/3/0/7/130776801/gogulokolobeja.pdf
    • http://alctcorp.com/uploads/1/3/0/8/130814873/6777826.pdf
    • http://hopesfarm.com/uploads/1/3/0/7/130739706/5918036.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075c5.bin
058ed97861b6dcde97a3f9af281b1631bfce7d255d42f420d49b9f01e8e261e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C5 9476 bytes

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