Malicious PDF — malware analysis report

Static analysis result for SHA-256 179c9ead75031b7c…

MALICIOUS

PDF

38.7 KB Created: 2020-03-11 01:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7cae61a003ab309bb03c7f66ae43443b SHA-1: 462dec2f471b6bc04ad904cc8ddfa27cd5ed88cd SHA-256: 179c9ead75031b7c10e11bcfddfbd5842fc8c8aae3570db941116db2af1df5fb
156 Risk Score

Malware Insights

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

This PDF document employs a link farm technique, presenting numerous URLs that masquerade as legitimate files but likely lead to malicious content. The document body, though partially corrupted, contains a clear lure for an 'Excel loan amortization schedule template download', directing users to a suspicious URL. The ML classifier strongly indicates maliciousness, and the presence of many algorithmically generated URLs points to a coordinated effort to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://mg3.brdge.org/uploads/1/3/0/6/130639325/130639325.html#excel+loan+amortization+schedule+template+download
    • http://havanesesouthafrica.com/uploads/1/3/0/8/130815192/f63a0.pdf
    • http://senatorpiacayetano.com/uploads/1/3/0/3/130323743/8191376.pdf
    • http://bridalmakeupnewcastlegateshead.co.uk/uploads/1/3/0/3/130312919/898941.pdf
    • http://qipaousa.com/uploads/1/3/0/2/130291646/nusolovotazenoj-biwimiribejik.pdf
    • http://nmwild.com/uploads/1/3/0/5/130551795/zoxabolis.pdf
    • http://flagcity5k.com/uploads/1/3/0/7/130775189/pemato_zunip_xuzafimejiwuzuv.pdf
    • http://ion8r.com/uploads/1/3/0/6/130621369/e8d5183e1726d.pdf
    • http://castlerockbakingcompany.com/uploads/1/3/0/6/130604645/ratutajotevawas-memugezoke-murujupepokob.pdf
    • http://mx.jwardcontractors.com/uploads/1/3/0/7/130740072/zovefevobofodafeki.pdf
    • http://nanni.info/uploads/1/3/0/7/130775958/muvogepojalo-xutomejuwekub-xoxod-dewadawekujinos.pdf
    • http://mmb.nyc/uploads/1/3/0/5/130589315/miwefikogoxofomowi.pdf
    • http://lukepetrosky.com/uploads/1/3/0/2/130272600/748966.pdf
    • http://piscesusa.piscesenterprises.com/uploads/1/3/0/3/130323271/kekavidip.pdf
    • http://bearnecessitiesworkshop.com/uploads/1/3/0/4/130483507/tajebevowekuv.pdf
    • http://www.fuszionmusic.com/uploads/1/3/0/2/130272603/mexew.pdf
    • http://endeavorsystems.net/uploads/1/3/0/8/130814782/6151236.pdf
    • http://daviscrossfield.com/uploads/1/3/0/6/130604640/demozurafivalikix.pdf
    • http://arlocksafe.com/uploads/1/3/0/5/130550881/4856601.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_off00006ceb.bin
3bc52cb9e255bffb21d23bc368c3e36b2b6ec458f45e6a10fd1e5752dafb3cd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEB 8340 bytes

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