Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d4896949a4b91d…

MALICIOUS

PDF

68.1 KB Created: 2020-06-12 18:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a97e5ff4d3db1dc2ba223514c680b80 SHA-1: ae64422fb7bac625a99902da616a4c7e51920b16 SHA-256: 84d4896949a4b91d1612791a9ffc5a2c0eb8c93b45c63e3958e63a2c7044047d
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF link farm'. This suggests a tactic to manipulate search engine results or to distribute malicious content. While no scripts were directly extracted, the presence of numerous external URLs points towards a potential phishing or content distribution vector. The ML classifier strongly indicated maliciousness.

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://webdisk.bay-net.org/uploads/1/3/0/6/130604641/130604641.html#chaine+d%2527+%25C3%25A9nergie+exercice+corrig%25C3%25A9
    • http://yowza-online.com/uploads/1/3/0/4/130476079/norewa.pdf
    • http://herbalholistics.net/uploads/1/3/1/3/131383619/993393.pdf
    • http://opcgivethegiftofart.com/uploads/1/3/0/5/130588573/aa292ccd672.pdf
    • http://wrenchmonster.org/uploads/1/3/0/7/130775612/d53a414.pdf
    • http://stellaboyd.com/uploads/1/3/0/5/130590375/bedofatowidaju_verosefe.pdf
    • http://livingthepondlife.org/uploads/1/3/0/5/130541077/zofovabijax_viveju.pdf
    • http://x0917202xstreamtravel.xsideas.com/uploads/1/3/1/3/131381961/4173744.pdf
    • http://thistlerose.com.au/uploads/1/3/1/3/131382320/5bef0.pdf
    • http://mail.outonthetowntransportation.com/uploads/1/3/1/3/131383548/9244288.pdf
    • http://host139.coedsportswear.com/uploads/1/3/0/5/130550824/tuxuzavivej-bujure-dodafakuz.pdf
    • http://endoftenancycleanplymouth.com/uploads/1/3/1/6/131637148/desukipipudexob.pdf
    • http://securetest.ekeskogs-ridingacademy.com/uploads/1/3/0/6/130604748/5720106.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://jemoxevirez.files.wordpress.com/2020/06/90382469871.pdf
    • https://dilupojuze.files.wordpress.com/2020/06/lofukupirasizipajise.pdf
    • https://fufejuf.files.wordpress.com/2020/06/zavijufod.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000de69.bin
2bd3ac60495473170a681e0c7d380a76bd73866d2b90d44cda669882f66df69b
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDE69 20840 bytes
font_00_sfnt_off0000ad98.bin
53582aba051e94065dd35e0d33453ed02ee5134cd36fe62c4736c4d8d31523b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD98 16092 bytes