Malicious PDF — malware analysis report

Static analysis result for SHA-256 9984e1a49fd3875e…

MALICIOUS

PDF

36.2 KB Created: 2020-03-16 04:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 7e3f3710e5ba7e29cde92d2f1d4e5d97 SHA-1: 48dc13529e5d206b35acd5980fa651f4886f1279 SHA-256: 9984e1a49fd3875ea443c8a48274bb2e178263b8c96bfe5030e3d8a312031465
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO spam campaign, designed to drive traffic or distribute malicious content. The document body itself contains garbled text and what appears to be metadata from the wkhtmltopdf tool, suggesting it was programmatically generated to host these links.

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://host29.carmichaelnl.com/uploads/1/3/0/8/130813100/130813100.html#etiologia+del+cancer+de+mama+pdf PDF link annotation
    • http://myschoolchoicestory.org/uploads/1/3/0/4/130483949/serenafexewana.pdfIn PDF document text
    • http://www.cjglitter.com/uploads/1/3/0/4/130436040/supobopaxex_mofosene_xeden_vobip.pdfIn PDF document text
    • http://www.gasolineandmarshmallows.com/uploads/1/3/0/2/130272347/7f298df9dacd04.pdfIn PDF document text
    • http://uclik.ca/uploads/1/3/0/7/130775741/jerojiwi.pdfIn PDF document text
    • http://reliabillsouthwest.com/uploads/1/3/0/6/130604902/6934264.pdfIn PDF document text
    • http://www.waxmeltsbyfrancesca.com/uploads/1/3/0/2/130271001/ropej-pirutimuredu-busuzewe-pifotuxegigokox.pdfIn PDF document text
    • http://wickedricks.com/uploads/1/3/0/6/130639107/49b21.pdfIn PDF document text
    • http://cmorell.com/uploads/1/3/0/4/130491271/71705f50197.pdfIn PDF document text
    • http://mailserver.harmonie-concert-band.org/uploads/1/3/0/5/130543437/48bba.pdfIn PDF document text
    • http://hostmaster.kirstyhigginsschoolofdancing.co.uk/uploads/1/3/0/2/130270777/10919.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

Related samples 1

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6477 8196 bytes
SHA-256: d645407dfa599e0361ceebf46aab4eab61bda43a8a2fef5c6ceee0e10313d590

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