Malicious PDF — malware analysis report

Static analysis result for SHA-256 a291b8df1e813ce7…

MALICIOUS

PDF

42.9 KB Created: 2020-03-16 17:10:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: bf45f07b8c514094635936f9a8f336a8 SHA-1: 44c2723ed2d41309ef356d4deddb9d4ccc895b78 SHA-256: a291b8df1e813ce7df743f8edfc2b23a2aed763c4ed0074b8d954e2e24f8f999
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The embedded URLs and the PDF_SEO_LINK_FARM heuristic firing confirm the presence of a link farm designed to lure users or influence search results.

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://ebmccallanbuildingltd.com/uploads/1/3/0/8/130813558/130813558.html#shooting+an+elephant+annotations+pdf PDF link annotation
    • http://pottshopp.com/uploads/1/3/0/6/130603747/6a14a410ff1d8a.pdfIn PDF document text
    • http://almansweide.nl/uploads/1/3/0/7/130739375/roxixuratofakoz-dewexod-zamusinevojale.pdfIn PDF document text
    • http://xcalligraff.com/uploads/1/3/0/6/130604141/timofewatozepu_joxijenut.pdfIn PDF document text
    • http://browntherapylincolnne.com/uploads/1/3/1/0/131071231/manuvema-mekixamobimire-lubovab.pdfIn PDF document text
    • http://www.solcreative.co.nz/uploads/1/3/0/6/130621161/nolavenemukerexema.pdfIn PDF document text
    • http://www.avilabankruptcylaw.com/uploads/1/3/0/6/130639423/rexabekagu.pdfIn PDF document text
    • http://weed-feed.me/uploads/1/3/0/4/130476733/6582684.pdfIn PDF document text
    • http://artm.website/uploads/1/3/0/3/130323616/nuzobasasudus.pdfIn PDF document text
    • http://trueleadershipconference.com/uploads/1/3/0/4/130488265/4491f439e383e65.pdfIn PDF document text
    • http://sirhall.com/uploads/1/3/0/6/130604620/vinopax-xagimare.pdfIn PDF document text
    • http://curbappealhomeremodeling.com/uploads/1/3/0/7/130775031/xumapakekejusuwuz.pdfIn PDF document text
    • http://www.drwpools.com/uploads/1/3/0/8/130814669/vomaxo.pdfIn PDF document text
    • http://rebuildcm.co/uploads/1/3/0/7/130776754/4017f8adc10f.pdfIn PDF document text
    • http://cidalcyc.com/uploads/1/3/0/6/130639668/88e5c.pdfIn PDF document text
    • http://nbalovin.com/uploads/1/3/0/5/130588931/wivevibudemas.pdfIn PDF document text
    • http://repnstep.net/uploads/1/3/0/7/130739945/xipodalofisorir-dalinanipori.pdfIn PDF document text
    • http://cookielovecustomsugarcookies.com/uploads/1/3/0/2/130288571/2942905.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000810a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x810A 7648 bytes
SHA-256: f5d2d883290909fb254728abff4ae2fa31e7e781f995a2b750b88f48b495c2e9