Malicious PDF — malware analysis report

Static analysis result for SHA-256 965f84b54a6d0d0a…

MALICIOUS

PDF

71.8 KB Created: 2021-01-08 21:12:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: be9c3200fa06664f4773f352f118b49a SHA-1: c23cb2bc5ec0a9e5f916b1e636b163dd0b7332c4 SHA-256: 965f84b54a6d0d0a2b7a6caa631286c197be681a265bcaafb4f031af08697d66
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting it is part of a link farm designed to manipulate search engine rankings or drive traffic. The document's content is presented as a 'Trigonometric functions worksheet with answers pdf', a common lure for educational or informational documents. No scripts were extracted, but the PDF structure itself facilitates the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://trafffe.ru/123?utm_term=trigonometric+functions+worksheet+with+answers+pdf PDF link annotation
    • https://nuzepobijane.weebly.com/uploads/1/3/4/8/134885792/telumeganad_kaneju.pdfIn PDF document text
    • https://lilobisuzi.weebly.com/uploads/1/3/4/6/134695815/mawowisetam_tapixigomebobuf_xapolotoripaz.pdfIn PDF document text
    • https://majijajivetik.weebly.com/uploads/1/3/4/2/134265766/1614857.pdfIn PDF document text
    • https://nukawopuriw.weebly.com/uploads/1/3/4/3/134347541/8336626.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/6505271.pdfIn PDF document text
    • https://dofukuligofevo.weebly.com/uploads/1/3/4/8/134869200/kujinu.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/djihcw6/megaxini.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/cancer_cuello_de_utero.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/lelasafirufagamonilenaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e75b072-89b0-476a-bafe-2332472531d8/zuxiboj.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/eclipse_ide_for_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/dozufuguxerubazonokudex.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/sociology_of_religion.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8B 5644 bytes
SHA-256: 0c5357756496badfd037ff61287e4098a09ed459de7813d5654a95273d7d2ed6
font_01_sfnt_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 10764 bytes
SHA-256: 8ecc43567acef549003f7cb11778f2b95630c862ff093442877cc00e511664c2