Malicious PDF — malware analysis report

Static analysis result for SHA-256 877a014813fdfda3…

MALICIOUS

PDF

133.0 KB Created: 2020-06-10 15:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 847255ba717e770a61f959d34d8ba5ee SHA-1: 254aa239692bb1a2b1e869af2e1381b50cea32c3 SHA-256: 877a014813fdfda37c65cc8cb5926f0c93649f0fd7e2af5b0a7603e52ecee6da
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The primary URL, http://buyfrombruce.com/uploads/1/3/0/3/130324072/130324072.html#cs6+%25ED%2581%25AC%25EB%259E%2599+%25EB%25B0%25A9%25EB%25B2%2595, is suspicious and likely part of a link farm or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and the ML classifier's high confidence suggest malicious intent, possibly involving JavaScript execution or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://buyfrombruce.com/uploads/1/3/0/3/130324072/130324072.html#cs6+%25ED%2581%25AC%25EB%259E%2599+%25EB%25B0%25A9%25EB%25B2%2595 PDF link annotation
    • http://ardencraig.co.uk/uploads/1/3/1/3/131379828/7336062.pdfIn PDF document text
    • http://i24.cz/uploads/1/3/0/4/130477074/muvipu.pdfIn PDF document text
    • http://randybergremodeling.com/uploads/1/3/0/3/130323693/pukomoj_vafatelutov.pdfIn PDF document text
    • http://storretrucking.shop/uploads/1/3/0/5/130551319/jibawumoxi-zunukiji-pejidudinevono.pdfIn PDF document text
    • http://sethgangwer.com/uploads/1/3/0/3/130312912/4752011.pdfIn PDF document text
    • http://davenaaron.com/uploads/1/3/1/4/131407797/lotalusapiferexejon.pdfIn PDF document text
    • http://admin.norfolkhumanists.com/uploads/1/3/0/6/130621717/8847606.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://puzedewufo.files.wordpress.com/2020/06/ligububufivotibamomame.pdfIn PDF document text
    • https://mamuxulajibi.files.wordpress.com/2020/06/sozavotoduzibobanedu.pdfIn PDF document text
    • https://tidulijewiso.files.wordpress.com/2020/06/kopef.pdfIn PDF document text
    • https://luwaliwev220981188.files.wordpress.com/2020/06/84733500054.pdfIn PDF document text
    • https://loxijesuvoti.files.wordpress.com/2020/06/wabonoxa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACD 67376 bytes
SHA-256: ca95d066e847859c2cc77af4602d985ccbd778bc22c805a0b97fbc58c0acae89
font_01_sfnt_off0001cb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB8A 10736 bytes
SHA-256: cf13615641f7db614d45efc6d849389f93daa9350fb6a446589a6a864e46cfe5
font_02_sfnt_off0001f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F06D 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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