Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea3398bda90f8f7…

MALICIOUS

PDF

46.2 KB Created: 2020-06-03 15:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 291121143a42d490b4164d0b3f5d13db SHA-1: 964050a2f52cb4f3241155f1bc3b5b47d42f831e SHA-256: bea3398bda90f8f77ace339bc7d8d392bf44e920dc1c015b7dcc29e08e4c7aea
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to these external resources, which could be used for SEO manipulation or to host further malicious payloads.

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://gotrsummit.com/uploads/1/3/0/4/130488875/130488875.html#abrelo+cuando+estes+triste
    • http://sitbackrobotics.com/uploads/1/3/0/3/130323127/3739096.pdf
    • http://greenstate-hydroponic-supply.com/uploads/1/3/1/6/131636644/wivujazipome.pdf
    • http://armsglobal.org/uploads/1/3/0/3/130313404/rowunu_zozaneviwibor_dejanamaj_zusuvudimozaru.pdf
    • http://regalhousekeepingdallas.com/uploads/1/3/1/6/131636826/mawipuvuso.pdf
    • http://jtbuilding-plastering.services/uploads/1/3/0/5/130544386/jeroziroxegipaxu.pdf
    • http://pharmainsights.ie/uploads/1/3/0/2/130288710/b47057bd9e2.pdf
    • http://hostmaster.lutheroratoriumkleeb.de/uploads/1/3/0/7/130776449/5210743.pdf
    • http://tvhdusa.net/uploads/1/3/1/4/131437413/mewulabutu.pdf
    • http://bridgepurchasing-solutions.com/uploads/1/3/0/4/130476601/4482112.pdf
    • http://gotrsummit.com/uploads/1/3/0/4/130488875/terms.html
    • http://gotrsummit.com/uploads/1/3/0/4/130488875/dmca.html
    • http://gotrsummit.com/uploads/1/3/0/4/130488875/policy.html
    • https://sumexarit.files.wordpress.com/2020/05/soxatuwetoxo.pdf
    • https://lanotojuvon.files.wordpress.com/2020/05/vofukiganejolifugujeti.pdf
    • https://zaturobu.files.wordpress.com/2020/05/19803086727.pdf
    • https://vegowukusa.files.wordpress.com/2020/05/fibobis.pdf
    • https://datugonirir.files.wordpress.com/2020/06/nabujabulagisabo.pdf
    • https://bidazinefak.files.wordpress.com/2020/06/76603841750.pdf
    • https://vuvobifo.files.wordpress.com/2020/06/namoliwixinotulewix.pdf
    • https://pobukurimu.files.wordpress.com/2020/06/zugogavumekadunisisa.pdf
    • https://zexosutu.files.wordpress.com/2020/06/96757183660.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fdc.bin
83c6c072cddb17da53e1d31f5cfd43da2fb7e117649ad01a31623659a12e3da0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDC 11320 bytes
font_01_sfnt_off000094ee.bin
af6545cc2318d27ecafec356b4bc3a1ae9bf93fb34fea327676f982b27d16dce
pdf-font-stream PDF embedded font (sfnt) at offset 0x94EE 16416 bytes