Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d4810d3594acee…

MALICIOUS

PDF

41.5 KB Created: 2020-04-03 04:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 81ede79f9f06bb51e1dfae1c5c853c95 SHA-1: c142a6e555ca76d79617b7a218972e1b4d8852cd SHA-256: 63d4810d3594acee11d03792d194d423aeab20d3cf2a78fb540d5d4c175e895a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to other PDF files on various domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine ranking for harmful sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://cyclebavaria.com/uploads/1/3/1/1/131164297/131164297.html#si+units+conversion+worksheet+answers+page+1
    • http://danyellaboutique.com/uploads/1/3/0/6/130620751/4787080.pdf
    • http://mx.jamesgerretyaia.com/uploads/1/3/0/5/130550818/kigeted.pdf
    • http://terravionportal.com/uploads/1/3/0/6/130620572/134bac.pdf
    • http://www.mission3075.org/uploads/1/3/1/4/131407537/wogibawoben.pdf
    • http://limonka-lodz.pl/uploads/1/3/0/9/130969772/727cf.pdf
    • http://epari.org/uploads/1/3/0/6/130639532/4c5831.pdf
    • http://d365digitalservices.com/uploads/1/3/0/7/130739419/togobuteg_nidowufewo_fatekipusizabuf.pdf
    • http://anokacommunitymission.net/uploads/1/3/0/7/130738972/gepajanub-besoni-lubedorux.pdf
    • http://fishingcountrynow.com/uploads/1/3/0/7/130775652/jolubiximo.pdf
    • http://stoneslifecoaching.com/uploads/1/3/0/6/130639535/af612e5.pdf
    • http://profloorinstallations.ca/uploads/1/3/1/4/131452870/dubitixa.pdf
    • http://teknakloni.com/uploads/1/3/1/3/131383352/totaraxizojal-fukugazuwaj.pdf
    • http://houseofcamden.com/uploads/1/3/0/8/130874333/024264873afbff.pdf
    • http://mocakolaid.com/uploads/1/3/0/7/130775676/6454084.pdf
    • http://ascensionlightgallery.com/uploads/1/3/1/4/131407836/dokiwulifa.pdf
    • http://cambridgepainters.ca/uploads/1/3/0/4/130476458/jozinukedo.pdf
    • http://extreme-science.com/uploads/1/3/1/3/131380870/fenereti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f3a.bin
fdfddcc216734290c02b5760048fd913fc3e916bc886ed04995ad9e1428de8cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3A 8068 bytes
font_01_sfnt_off00008eb0.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB0 2652 bytes