Malicious PDF — malware analysis report

Static analysis result for SHA-256 13719bc447d12033…

MALICIOUS

PDF

35.2 KB Created: 2020-06-14 18:40:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 130e976d02a95d823326ae4ad048c528 SHA-1: 3b37c0f5d052160b5ab854fea9412f12daccf5f1 SHA-256: 13719bc447d120332a6b191917c975851e45cb649f510a402fd50732d311de71
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. The embedded document body, though partially corrupted, contains text related to an 'Albert Einstein reading comprehension worksheet' and includes URLs that are likely part of a malicious redirection scheme.

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://3hh.undesirable.us/uploads/1/3/1/6/131636676/131636676.html#albert+einstein+reading+comprehension+worksheet
    • http://hostmaster.pgkitchenfitters.co.uk/uploads/1/3/0/4/130489051/8295186.pdf
    • http://kingdomresourcesintl.com/uploads/1/3/0/5/130588182/kemebanazozaki-finesa-kopik.pdf
    • http://alcoholstudie.nl/uploads/1/3/1/0/131070806/163640.pdf
    • http://mail.goedkoopmerkfietsen.com/uploads/1/3/0/9/130969563/ebc571e36b0.pdf
    • http://rivastix.mobi/uploads/1/3/1/3/131380177/5016823.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://vajowobago.files.wordpress.com/2020/06/75007755369.pdf
    • https://gavadopojame.files.wordpress.com/2020/06/9103717311.pdf
    • https://lozegakoj.files.wordpress.com/2020/06/xaxanojuxorifivaxaxo.pdf
    • https://jorasemop.files.wordpress.com/2020/06/nuzevelofaz.pdf
    • https://suxeniruwip.files.wordpress.com/2020/06/jufutinajeri.pdf
    • https://raxunorol.files.wordpress.com/2020/06/lipojasujatavoxi.pdf
    • https://vitimatojegi.files.wordpress.com/2020/06/kinipelixudig.pdf
    • https://jeluzonodifi.files.wordpress.com/2020/06/pebepedijil.pdf
    • https://negoxojes.files.wordpress.com/2020/06/fudezireritaxowo.pdf
    • https://zezetofijopi.files.wordpress.com/2020/06/surutaxojesojigin.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f2d.bin
c36c2ef92f04b0dcebeb796b8f40e668a74608b0ac6deee69273902594e0a978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2D 9824 bytes

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