Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b2014967e0a4c5…

MALICIOUS

PDF

34.4 KB Created: 2020-06-14 19:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f9f8af584e424d2c3fd316f47db4018 SHA-1: e652eab0b3458e78f8aec4fd4804f576f223497c SHA-256: 10b2014967e0a4c57828510cf25d796e80430b93fa1e7813a77ef2ee6c893a02
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are structured as SEO spam or link farm content, suggesting a malicious intent to drive traffic to potentially harmful sites. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links aligns with techniques used for distributing malware or conducting phishing. No scripts were extracted, but the primary attack pattern involves redirecting users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bubbleshineservices.com/uploads/1/3/0/6/130639510/130639510.html#types+of+v-belts+pdf
    • http://gagen.com/uploads/1/3/0/5/130539913/7965908.pdf
    • http://syffry.com/uploads/1/3/2/3/132303170/aa23b451be0f.pdf
    • http://unitedplanningsolutions.com/uploads/1/3/1/6/131636774/2938145.pdf
    • http://wirelessertx.com/uploads/1/3/1/3/131380066/wuduket-fekawi-pirawi-nupagutosaz.pdf
    • http://thesteadfasthomemaker.com/uploads/1/3/0/2/130288710/mejumewulodope-tigudinefebofi-fozukegisa-nifamoxewud.pdf
    • http://mail.curiouscata.com/uploads/1/3/0/5/130588698/sokepozazozesuzexasu.pdf
    • http://drcampana.com/uploads/1/3/0/4/130483761/lapexasepewofez.pdf
    • http://peopleinsyncltd.com/uploads/1/3/0/3/130313002/9468924.pdf
    • http://interieurschrijnwerken.com/uploads/1/3/1/1/131164375/75f61ce4c85.pdf
    • http://parents.sprigeo.com/uploads/1/3/1/3/131379824/9763717.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://buzitafovudu937855434.files.wordpress.com/2020/06/mejemozegilegisepasikun.pdf
    • https://jakibit.files.wordpress.com/2020/06/72182417118.pdf
    • https://vetaxuvewaf.files.wordpress.com/2020/06/pubalojojaxerezawezebosu.pdf
    • https://janivuveraku.files.wordpress.com/2020/06/julumakanuposi.pdf
    • https://tudavolo.files.wordpress.com/2020/06/tepivoxidavesa.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_off00005d78.bin
9e2b55c991528bd44ea576215e52f285592dedb4891b83e82abf22cc442a99fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D78 9632 bytes

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