Malicious PDF — malware analysis report

Static analysis result for SHA-256 684dd5b920a91083…

MALICIOUS

PDF

41.7 KB Created: 2020-03-15 02:10:40 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4f0490ca3379ba703843b71dd5074e21 SHA-1: c5d15b44d452bacb1f1209ff0077c7d78d44afac SHA-256: 684dd5b920a9108339c50fa9768d8c4fc80cb8da4508669c70cea80155f5803d
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links to external websites, disguised as an Excel spreadsheet. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or redirection scheme. The embedded URLs are likely used to host malicious content or phishing pages. No scripts were extracted, but the structure and numerous external links point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://webdisk.storgebhs.com/uploads/1/3/0/4/130476766/130476766.html#excel+spreadsheet+only+shows+up+in+fullscreen
    • http://hostmaster.solar-simulator.info/uploads/1/3/0/2/130288939/suridafelubome-vevir.pdf
    • http://www.lesloupandises.com/uploads/1/3/0/3/130323126/zabax-zijudegirivalow-tikop-tepidodigetafi.pdf
    • http://jsmtutoring.com/uploads/1/3/0/4/130483125/0459fb211ce65.pdf
    • http://www.dear-jewellery.com/uploads/1/3/0/6/130605018/mijemowo.pdf
    • http://hilltopministries.org/uploads/1/3/0/7/130775392/6817573.pdf
    • http://www.ivankevin.com/uploads/1/3/0/5/130551692/likoroxujogetupok.pdf
    • http://hamlearn.com/uploads/1/3/0/6/130604050/1276687.pdf
    • http://hillsborotechcenter.org/uploads/1/3/0/6/130603935/vurekikaril.pdf
    • http://chloeimaan.com/uploads/1/3/0/6/130620547/4089391.pdf
    • http://www.ateliersimonne.be/uploads/1/3/0/8/130873851/5fd73fcf9411cb2.pdf
    • http://bfgcommercial.com/uploads/1/3/0/6/130605472/fikifonagav.pdf
    • http://johntejada.net/uploads/1/3/0/2/130272387/rusela-fizadi-wofagogobize-vuxanudog.pdf
    • http://monterreyparknotarypublic.com/uploads/1/3/0/2/130270911/sibetefijitezet.pdf
    • http://www.rickstowingandrecovery.com/uploads/1/3/0/6/130605376/86bab9aba.pdf
    • http://georgwebbtogo.com/uploads/1/3/0/4/130435680/3806082.pdf
    • http://burnellinfinitymath.com/uploads/1/3/0/6/130620958/f25f3c45a.pdf
    • http://cpanel.weddingstentsevents.com/uploads/1/3/0/5/130588424/99c3614bd1f9.pdf
    • http://shopwithwalkerpls.com/uploads/1/3/0/4/130476885/5812656.pdf
    • http://lawnwhipper.com/uploads/1/3/0/5/130540010/wovow_kifosibexa.pdf
    • http://mhsorchestra.org/uploads/1/3/0/5/130589104/xekuzimapam.pdf
    • http://coachingkits.co/uploads/1/3/0/6/130639321/cc2f178e6c5.pdf
    • http://hawaiiblogging.com/uploads/1/3/0/6/130620747/b8ed77b75.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_off00007654.bin
57e0b1ba125e186ed81244c031d0958e4ac144f780c3d366708f25f057ec8291		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7654 8464 bytes

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