Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d8f6433951fbc7…

MALICIOUS

PDF

49.4 KB Created: 2020-04-03 14:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b15c355acc51a6158c284474a3c20e22 SHA-1: 5baf73507e94d42b41bcb1ba361cf45c3def1193 SHA-256: 73d8f6433951fbc7a2175ccbe3b7ecfe3add2396d787a955b3b31c3993f0d18e
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure suggests a link farm or SEO manipulation tactic, potentially leading to malicious content distribution or phishing.

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://ugrowbc.com/uploads/1/3/0/3/130379743/130379743.html#cita+de+cita+ejemplos+apa
    • http://a-servant-heart.com/uploads/1/3/0/2/130288926/pidifovu.pdf
    • http://business-english-on-line.com/uploads/1/3/0/8/130814594/2503130.pdf
    • http://vibrationsforlife.com/uploads/1/3/0/5/130543064/597016.pdf
    • http://healingshamanenergy.com/uploads/1/3/0/6/130605077/nuvaraxu.pdf
    • http://hoovertreeservice.com/uploads/1/3/0/4/130477839/102282.pdf
    • http://theconservatarianpost.com/uploads/1/3/0/6/130622077/170786.pdf
    • http://dailycarolinadeals.com/uploads/1/3/0/6/130639304/2862099.pdf
    • http://khaliafrazier.com/uploads/1/3/1/3/131382595/lebogaxo-sapedidixo.pdf
    • http://queenvoyage.com/uploads/1/3/0/6/130621657/da5d916f7fd5d.pdf
    • http://thedadadvice.com/uploads/1/3/0/2/130270882/danon.pdf
    • http://outfitradar.com/uploads/1/3/0/5/130547659/jevevasa.pdf
    • http://rslivings.com/uploads/1/3/0/3/130379183/8693922.pdf
    • http://adenova.es/uploads/1/3/0/3/130379634/3b8c7d7e00be.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081a7.bin
e87f2c4e870611aab986c4131bc4bd7f55256e23a336b1c70f76f0f50680e403		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A7 8956 bytes
font_01_sfnt_off0000a244.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA244 16036 bytes

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