Malicious PDF — malware analysis report

Static analysis result for SHA-256 5950e0a6d6a58aea…

MALICIOUS

PDF

41.3 KB Created: 2020-05-20 20:39:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec887909a5ad6ac6492341bb05216139 SHA-1: a8f668cbbceca4e460135e91f16142242dc07ff7 SHA-256: 5950e0a6d6a58aea6b432701594761f45f6f3fe38da0be142e261f8ee486891d
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 to other PDF files hosted on various domains. This pattern is indicative of SEO poisoning or a link farm designed to distribute malicious content or drive traffic to compromised sites. No scripts were extracted, but the sheer volume of external links suggests a coordinated effort to redirect users. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mkffl.com/uploads/1/3/1/6/131636651/131636651.html#campbell+biology+8th+edition+chapter
    • http://jjhomez.com/uploads/1/3/0/6/130620746/widekufosutasimexixo.pdf
    • http://firststreetgaragedogs.com/uploads/1/3/1/1/131164506/24b325.pdf
    • http://novelistarchives.com/uploads/1/3/1/4/131406659/vomisiba.pdf
    • http://microbusinessawards.eu/uploads/1/3/1/4/131437099/1042726.pdf
    • http://bslartquilts.com/uploads/1/3/1/6/131637477/5153223.pdf
    • http://wesayplay.com/uploads/1/3/0/9/130969077/tunidikez.pdf
    • http://indirectsupplychain.com/uploads/1/3/0/6/130620532/bekibo.pdf
    • http://maryannweber.com/uploads/1/3/0/5/130588232/ebe2dff328.pdf
    • http://topgunfinancialservices.com/uploads/1/3/1/4/131453283/xojorovu.pdf
    • http://upperjeans.xyz/uploads/1/3/0/6/130604054/6993756.pdf
    • http://verified-appleid.com/uploads/1/3/0/5/130589213/0989308079c9.pdf
    • http://kaparnman.com/uploads/1/3/0/2/130272339/ruruxuvowapebugugebe.pdf
    • http://fromearthwithlove.shop/uploads/1/3/0/2/130271087/zubovuled.pdf
    • http://garagedoorrepair-tustinca.com/uploads/1/3/0/2/130272385/zopelujegotawip.pdf
    • http://seeingeyedogsnhd.com/uploads/1/3/0/7/130775723/motegujivoj_ruzizex.pdf
    • http://goodlifetravelagency.com/uploads/1/3/0/6/130639565/da0ec27082084c.pdf
    • http://wheatley-consultancy.com/uploads/1/3/0/5/130544078/6281836.pdf
    • http://sureprohome.com/uploads/1/3/0/4/130476327/4664135.pdf
    • http://cnstrategies.net/uploads/1/3/1/6/131637503/6638703.pdf
    • http://theglammbar.com/uploads/1/3/0/7/130739105/1735218.pdf
    • http://yes-charity.net/uploads/1/3/0/3/130379488/9a4c1f6de65.pdf
    • http://thefreezemachine.com/uploads/1/3/1/3/131398517/kofatasadojiwawogu.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_off0000715a.bin
8237621fc38a7b11bec2a59b6e0ca76f6ed03edbbabdeb20fbfc8db69ff320c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x715A 11200 bytes