Malicious PDF — malware analysis report

Static analysis result for SHA-256 81179f9fcc001984…

MALICIOUS

PDF

37.9 KB Created: 2020-04-10 00:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1ce19dbec5b9176d444775fbfca870f0 SHA-1: b2e5503fa2ce8526c2c1c0e1db5636ded1d00828 SHA-256: 81179f9fcc001984c6cbc53e029676077882f5b0080700c6ae94b13b748245b0
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-optimized links to other PDFs. The document body, though heavily obfuscated, contains references to a 'child psychotherapy progress notes planner pdf' and includes URLs that likely lead to malicious content or further phishing attempts. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://toy4wdtacom10.com/uploads/1/3/0/6/130620207/130620207.html#child+psychotherapy+progress+notes+planner+pdf
    • http://yaelgrinberg.com/uploads/1/3/0/6/130605167/tafuzefaz.pdf
    • http://support-de-facturation.net/uploads/1/3/0/7/130740113/2334072.pdf
    • http://sheansugar.com/uploads/1/3/1/4/131407014/4f05c3e.pdf
    • http://drgregmaguire.com/uploads/1/3/1/4/131406710/lefesi-gipolivizusib-rezori.pdf
    • http://eastlakebuilders.com/uploads/1/3/0/7/130776454/94180.pdf
    • http://opaxglobal.com/uploads/1/3/0/3/130379179/nesifejevizab-vapelixalezalal.pdf
    • http://tutarjetadescuento.com/uploads/1/3/0/4/130489262/81f4e9.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_off00006b01.bin
bc29b0e1c95ad3022eb74a39abff2e710fd32b7447213af7d1c924b45a42e062		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B01 8236 bytes

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