Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e37dd5317de618…

MALICIOUS

PDF

52.8 KB Created: 2020-04-07 07:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 24d60175baca94ede6ade3cf14dc9eb7 SHA-1: 2627de11134cf33c13146c849307940e29caae9b SHA-256: 80e37dd5317de618d9ee483812b9f80e791db4bc7c5d3b6ee2715f7e83bc6ebb
96 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to domains that appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a network of SEO-optimized PDF hosting sites, likely as a distribution point for further malicious content or phishing attempts. No scripts were extracted, and the document body was heavily obfuscated.

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://e-volvealready.com/uploads/1/3/0/2/130273987/130273987.html#clasificacion+de+colangitis+tokio+2018
    • http://resa5adultbasiceducation.com/uploads/1/3/0/5/130551433/pigupamunanononu.pdf
    • http://temuyeme.com/uploads/1/3/0/7/130739696/bf2325199940e.pdf
    • http://vaxholmpaintball.se/uploads/1/3/0/6/130621293/pixaragelupameni.pdf
    • http://robinshome.org/uploads/1/3/0/8/130814190/0ec7d0cc5643ac4.pdf
    • http://meumundodepapel.com/uploads/1/3/0/7/130775509/punibidubun.pdf
    • http://peoplelikeusevents.com/uploads/1/3/0/6/130620429/2633557.pdf
    • http://embraceyourshadow.com/uploads/1/3/0/5/130588805/eba2e4aecf0.pdf
    • http://theejollyjolie.com/uploads/1/3/0/6/130603905/sexaretufukitik.pdf
    • http://wendyguindi.com/uploads/1/3/0/5/130539818/348d9.pdf
    • http://blackgirlsurbanplan.com/uploads/1/3/0/2/130292148/4db51c6e3c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b0e.bin
1355550cfdcf33e2921bf565488a6e23a6319f07cef34efb9051ea60f0d01f1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0E 7724 bytes
font_01_sfnt_off000088f3.bin
a3993d24752630fc0123bd34138188f0e35531f6e334e1bcf868022f82a12c7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88F3 11588 bytes
font_02_sfnt_off0000ae0a.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0A 16204 bytes

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