Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a82d65fdef65d4…

MALICIOUS

PDF

89.4 KB Created: 2020-06-05 02:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61d9eebb41d5ed9357b305bd6e91a30f SHA-1: d2b20693e60fe18d2babcb0165754499d1651bf1 SHA-256: 18a82d65fdef65d45a8039b548c6303a09d9bef59ef791255f2bae0d077c9975
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a heuristic firing for a link farm, indicating it hosts a large number of external links. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, contains URLs that are part of this link farm, suggesting the primary purpose is to redirect users to potentially malicious content or for SEO manipulation.

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://wagenselleryoga.com/uploads/1/3/1/0/131071057/131071057.html#los+trabajos+de+persiles+y+sigismund
    • http://369.undesirable.us/uploads/1/3/1/0/131071210/muvubizamuwaxar_polomoxurig_bukalataz.pdf
    • http://bickishfamily.com/uploads/1/3/0/7/130775465/9ff5018870a.pdf
    • http://otterycommunitytheatre.co.uk/uploads/1/3/1/3/131398574/bepegiku.pdf
    • http://fallinglava.com/uploads/1/3/1/3/131398128/aff8327b4ee4e33.pdf
    • http://selfsense.org/uploads/1/3/0/8/130873890/dupizug-dazolonigis.pdf
    • http://licensedtolight.com.au/uploads/1/3/0/6/130603941/9794217.pdf
    • http://cabinetgauthiermallet.ca/uploads/1/3/0/2/130272095/fosoponoduwat_pazazibesuxesex_mikeberosugarej.pdf
    • http://lawyerrichardson.com/uploads/1/3/0/4/130489131/vezamop_kodilute_niwawesirasinas_dikolada.pdf
    • http://reginaldforeman.com/uploads/1/3/1/1/131164012/dumesegesu_rabogadudutetep.pdf
    • http://pfckarate.com/uploads/1/3/0/8/130814066/jovabeferir_sifolu.pdf
    • http://doohickeysonline.com/uploads/1/3/0/5/130590334/8193694.pdf
    • http://mygvhs.com/uploads/1/3/0/7/130739173/9664034.pdf
    • http://wagenselleryoga.com/uploads/1/3/1/0/131071057/terms.html
    • http://wagenselleryoga.com/uploads/1/3/1/0/131071057/dmca.html
    • http://wagenselleryoga.com/uploads/1/3/1/0/131071057/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://rokojozosiwi.files.wordpress.com/2020/06/konefuvagizizoro.pdf
    • https://tofosigon.files.wordpress.com/2020/06/gakonenex.pdf
    • https://dorekumu.files.wordpress.com/2020/06/67985963939.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131f6.bin
46748573e45254ff69872dc862ee654e23b681db9ee59a708ddab7709a1fe012
pdf-font-stream PDF embedded font (sfnt) at offset 0x131F6 11760 bytes