Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf61ff47599a46d…

MALICIOUS

PDF

35.9 KB Created: 2020-03-31 03:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f118b71b155bf83f726dfcdee00cdcea SHA-1: 956f92251e1b8bdd519b7d8cc8c230fb176f1df1 SHA-256: 5bf61ff47599a46d67566cbf7117b834e3a4ff8586960db9d543ad8e216fed6f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, http://hydroservtechnology.com/uploads/1/3/1/4/131438068/131438068.html#whirlpool+washer+dryer+fault+codes, is presented as information about appliance fault codes to entice users to click. The ML classifier strongly indicated maliciousness, and the overall structure points to a malicious document designed to drive traffic to potentially harmful sites.

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://hydroservtechnology.com/uploads/1/3/1/4/131438068/131438068.html#whirlpool+washer+dryer+fault+codes
    • http://aninspiredstory.com/uploads/1/3/0/3/130313093/9026335.pdf
    • http://artcongroup.com/uploads/1/3/0/6/130639147/wopadom.pdf
    • http://4ufundraising.ca/uploads/1/3/1/3/131379194/fulasasikegor_geluzoxum_fidipufak_fidotig.pdf
    • http://theradicalarmy.com/uploads/1/3/0/4/130488157/70d646a.pdf
    • http://cruxsante.com/uploads/1/3/0/4/130476976/6660880.pdf
    • http://remarkablecanine.com/uploads/1/3/1/3/131379189/701762e.pdf
    • http://glendalepoolcleaners.com/uploads/1/3/0/5/130588214/sorajilam_sobutu.pdf
    • http://harrisandcompanyllc.com/uploads/1/3/0/9/130969327/010d284a.pdf
    • http://darkmoonwitchery.com/uploads/1/3/0/5/130589435/f413a73.pdf
    • http://akilinc.com/uploads/1/3/1/1/131163854/6953723.pdf
    • http://catholicchristianlifecoach.com/uploads/1/3/0/4/130435922/rovuz_sexoruteture.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_off00006597.bin
eed31cd0e1a9658e9d0c729bf34b3012da1123129370cdcdb47acc99765fcf6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6597 7444 bytes

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