Malicious PDF — malware analysis report

Static analysis result for SHA-256 7367c8c9044ab71a…

MALICIOUS

PDF

38.8 KB Created: 2020-06-06 09:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52a1cfd8c4b18c0cfe5acb69a01effd7 SHA-1: 1b1b15a24a307afe63ba62dda2b48a391b3f1166 SHA-256: 7367c8c9044ab71a3945ead1081d6876191382910420412ca7ab229978aa032a
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are structured as SEO-friendly slugs pointing to other PDF files. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of external links, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely used for phishing or distributing further malware.

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://pitchperfecttravel.voyagerwebsites.com/uploads/1/3/0/2/130272973/130272973.html#handbook+of+clinical+psychopharmacology+for+therapists+eighth+edition
    • http://krazytails.com/uploads/1/3/1/4/131407178/sawupikuv.pdf
    • http://themusictheater.com/uploads/1/3/1/4/131455019/6567050.pdf
    • http://sipna.website/uploads/1/3/1/6/131636664/jakudetedikolov.pdf
    • http://dukesconsultingservice.net/uploads/1/3/1/3/131398222/22555.pdf
    • http://classactionnewsletter.com/uploads/1/3/1/3/131379014/780595.pdf
    • http://breezystaffingsolutions.com/uploads/1/3/1/3/131398313/pejijibusabuwib-nuvisafak-rofodenokamizo-mapofetedi.pdf
    • http://pitchperfecttravel.voyagerwebsites.com/uploads/1/3/0/2/130272973/terms.html
    • http://pitchperfecttravel.voyagerwebsites.com/uploads/1/3/0/2/130272973/dmca.html
    • http://pitchperfecttravel.voyagerwebsites.com/uploads/1/3/0/2/130272973/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://rizozilojaje.files.wordpress.com/2020/06/wovomur.pdf
    • https://dogigagifu.files.wordpress.com/2020/06/87511152523.pdf
    • https://vitosomuzete.files.wordpress.com/2020/06/tilokedaw.pdf
    • https://rajibixevako.files.wordpress.com/2020/06/80025128503.pdf
    • https://rawujax.files.wordpress.com/2020/06/15719952901.pdf
    • https://rukigol34928554.files.wordpress.com/2020/06/zodoluwunevivowobe.pdf
    • https://wegekivosum.files.wordpress.com/2020/06/41484934571.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_off00006c40.bin
8597f01d0ee0170f05721e027cbafef37da167edf54b6e1589a799f0a5cab71f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C40 10092 bytes