Malicious PDF — malware analysis report

Static analysis result for SHA-256 97abcd1bd8d93e63…

MALICIOUS

PDF

32.0 KB Created: 2020-03-20 12:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f2379808d4b7bc7352f6330f473370e5 SHA-1: 7c955fd9e7f5cc60b7a7dde581482aefe3f226fb SHA-256: 97abcd1bd8d93e63d39d2face6fa4019b5e20efd7e5ba680f646e5c70b0c5148
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or SEO spam campaign, designed to drive traffic to potentially malicious or ad-filled websites.

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://benkregel.com/uploads/1/3/0/8/130814040/130814040.html#notas+da+musica+aleluia+na+flauta+transversal
    • http://richardgeraffo.com/uploads/1/3/0/4/130483205/luvosulopimite_jogopidofezi_fujumefuwukot_nadiwujibit.pdf
    • http://coolcreativecreations.com/uploads/1/3/0/4/130477839/1863701.pdf
    • http://kennethcoxflute.com/uploads/1/3/0/5/130542920/7268370.pdf
    • http://www.lifeguardinginstructor.com/uploads/1/3/0/4/130477541/lemogatodofumef-zagadotor-tavaloxuzuj.pdf
    • http://onlinesound.com.au/uploads/1/3/0/4/130436519/dcf3f2ad1d.pdf
    • http://mail.gilmont.org/uploads/1/3/0/7/130738700/af682f799a9e500.pdf
    • http://mail.ballroomdance.ch/uploads/1/3/0/5/130588542/98a66.pdf
    • http://www.ayeyarwaddyinternationalschool.com/uploads/1/3/0/5/130542912/2bb321669ace2e0.pdf
    • http://www.studioviemen.com/uploads/1/3/0/4/130490410/sivorola.pdf
    • http://autodiscover.ingridliberte.com/uploads/1/3/0/4/130483210/kutozojifipiji.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_off00005212.bin
9ffb7451ef76176a730bead3ff613d147c8e57d0f36629c7d7072d308ab76303		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5212 8968 bytes

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