Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d621c623a36b9e3…

MALICIOUS

PDF

42.7 KB Created: 2020-04-10 03:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 33688429bc7ed4443b92757bf08f3946 SHA-1: 958a64204bb1c34c169344d126b77349a3e3fd9b SHA-256: 0d621c623a36b9e38776e9bffc95233892b567dcaa705660c1ff43f05047b1ab
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links to various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs likely serve as a link farm to manipulate search engine results or to distribute malicious payloads.

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://minnesotahydrographics.com/uploads/1/3/0/8/130813554/130813554.html#ejercicios+resueltos+metodo+de+dos+fases
    • http://froomiesdetail.com/uploads/1/3/0/4/130488345/zasetavunejexego.pdf
    • http://scoopsphotography.com/uploads/1/3/0/9/130969247/533923f17c.pdf
    • http://stephanielloydactor.com/uploads/1/3/0/9/130969541/rujoteviwovux.pdf
    • http://goldheartpersians.com/uploads/1/3/1/0/131070381/de3fe1.pdf
    • http://refugedajourney.com/uploads/1/3/1/4/131452841/7945907.pdf
    • http://juliedmurray.com/uploads/1/3/0/2/130291499/6478559.pdf
    • http://greenroomtheatercompany.com/uploads/1/3/0/6/130620603/tiganaxogetakoror.pdf
    • http://pricewalkerconsultancy.com/uploads/1/3/0/6/130604841/zotav_giseto.pdf
    • http://digitalconfectionsnyc.com/uploads/1/3/0/2/130272362/mumomadafawabuwazo.pdf
    • http://wellnesswithoutpity.com/uploads/1/3/0/5/130588492/jatemewimepaz_tifikizemem_zoxiveto.pdf
    • http://thought-for-free.com/uploads/1/3/1/3/131379789/woporeketivi_mipilavas_tefedafozoxidul_kamotiliju.pdf
    • http://chevroletmallorca.com/uploads/1/3/1/3/131382274/4071630.pdf
    • http://foodandbeveragecareers.com/uploads/1/3/0/7/130739831/bewufokomometugazasa.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_off00007a36.bin
f3073f1360a6638a0de3cc09c754f1f66bf7312b210f831646a748aed694561a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A36 9240 bytes

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