Malicious PDF — malware analysis report

Static analysis result for SHA-256 85937c4c5f9c73e5…

MALICIOUS

PDF

52.6 KB Created: 2020-04-09 23:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 48059476dc2de97803b7ac78ff14badf SHA-1: fc0275c0796d38334bd4da10d6821ab418dc5f80 SHA-256: 85937c4c5f9c73e5a46d25a9fc063d34825d0e6ca827e727be7e4150fe00a68e
62 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files on different domains. This behavior is indicative of a link farm or SEO spam campaign, designed to drive traffic to a network of sites. The document body text, though partially corrupted, contains a title related to physics exercises, likely a lure to disguise the malicious intent. No scripts were extracted, and the primary malicious activity observed is the distribution of numerous external links.

Heuristics 3

  • 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
  • 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://beernationdistributors.com/uploads/1/3/0/5/130539922/130539922.html#ca%C3%ADda+libre+y+tiro+vertical+ejercicios+resueltos
    • http://getmedalert.net/uploads/1/3/1/4/131406344/b4a5328ee033b8.pdf
    • http://saturdayeveninggardens.com/uploads/1/3/1/3/131398125/937af7.pdf
    • http://reedbrook.com/uploads/1/3/1/3/131382081/mavunanoro_resitub.pdf
    • http://whitemountainremodel.com/uploads/1/3/0/9/130969712/4dbc12ab8f2b6c1.pdf
    • http://doarse.net/uploads/1/3/1/4/131408854/xosasowonafibo.pdf
    • http://functionalmedicineforhealth.com/uploads/1/3/0/5/130588603/9080357.pdf
    • http://drencheddivers.com/uploads/1/3/0/6/130605248/finob.pdf
    • http://thetrendycowgirlboutique.com/uploads/1/3/0/5/130542734/2709722.pdf
    • http://corinnaraeyoga.com/uploads/1/3/0/6/130603819/rivekosikegibi.pdf
    • http://nfctigers.com/uploads/1/3/1/4/131438523/103d7128.pdf
    • http://breaktobrush.com/uploads/1/3/0/4/130436162/remoxafufa_tugekigemafima.pdf
    • http://empleos.fun/uploads/1/3/1/1/131164007/4688457.pdf
    • http://thegardenstategreat.com/uploads/1/3/0/7/130775902/wapos.pdf
    • http://teachingallpeople.com/uploads/1/3/0/5/130551697/33fe2cacde87.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f78.bin
1957428794578a072b8983e864e5701b52391162abfb2d6d14c6295fa8a16687		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F78 6444 bytes
font_01_sfnt_off00007f3a.bin
ed40df269913c96c4d90b11d63e5361361c6f4b47b0f8dc13835d1c516773523		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F3A 8280 bytes
font_02_sfnt_off00009da6.bin
a17c0593d5d519e99d55f917317ab54813164a5c96b470a394f526877d458548		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DA6 3704 bytes
font_03_sfnt_off0000ab7c.bin
322701f1f7ce52f1e2c270a0bb3090cbbccd2613e2548c816e08e746c3346379		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB7C 16344 bytes

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