Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2724e5cf9e9c38…

MALICIOUS

PDF

44.5 KB Created: 2020-06-04 23:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccb31b97b2dbf88d5f76957cb472f669 SHA-1: b84a7f41905d03f159d9035f926be3af6b2c47b9 SHA-256: eb2724e5cf9e9c38960dee8b4ebc000e4505d99afa66d39b5ce3f3a2c8f8bf02
94 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The primary purpose appears to be directing users to a large collection of other PDF files hosted across various domains, likely for SEO spam or to distribute further malicious content.

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://mail.bardosdiamondsports.com/uploads/1/3/0/2/130289519/130289519.html#fides+sergas+listas
    • http://freetransit.org/uploads/1/3/1/6/131637161/3e6195a02fc66b.pdf
    • http://lifeandhealthbyhanley.com/uploads/1/3/0/5/130590739/zuzidejeramog_nebukasakedomav_dulogadez.pdf
    • http://mx.itekin.com/uploads/1/3/1/4/131437667/577535d3.pdf
    • http://rent-alo.it/uploads/1/3/0/2/130289495/jezediz.pdf
    • http://m3smedia.com/uploads/1/3/1/6/131637942/8009559.pdf
    • http://matchcenografiadeeventos.com/uploads/1/3/0/6/130640218/tabajob.pdf
    • http://mta-sts.mx.harperkinetics.com/uploads/1/3/0/4/130475918/6199077.pdf
    • http://vanic.nl/uploads/1/3/1/0/131070535/repuvexotitej_gusagi_volufoburevigi.pdf
    • http://birkdaleawards.com/uploads/1/3/0/7/130739472/3023144.pdf
    • http://mail.bardosdiamondsports.com/uploads/1/3/0/2/130289519/terms.html
    • http://mail.bardosdiamondsports.com/uploads/1/3/0/2/130289519/dmca.html
    • http://mail.bardosdiamondsports.com/uploads/1/3/0/2/130289519/policy.html
    • http://lifeandhealthbyhanley.com/uploads/1/3/0/5/130590739/zuzidejeramog_nebukasak
    • https://patodulamup.files.wordpress.com/2020/06/41473634076.pdf
    • https://mubafaxaf532301989.files.wordpress.com/2020/06/nazevubuvulabep.pdf
    • https://gewarejim48646281.files.wordpress.com/2020/06/20902948865.pdf
    • https://kemetax.files.wordpress.com/2020/06/19983208538.pdf
    • https://meluvib.files.wordpress.com/2020/06/63382099323.pdf
    • https://rigumiroviwe.files.wordpress.com/2020/06/43267864694.pdf
    • https://tasozuf.files.wordpress.com/2020/06/29654207093.pdf
    • https://kunenoka.files.wordpress.com/2020/06/58376432295.pdf
    • https://safowus.files.wordpress.com/2020/06/sizedomazakar.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007edd.bin
3c7056036549c7fbe3d2dc41f1d7f1298d147702bed79e545b4bb163084d59bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDD 11640 bytes