Malicious PDF — malware analysis report

Static analysis result for SHA-256 650a88c73fa960fd…

MALICIOUS

PDF

51.3 KB Created: 2020-03-21 12:09:34 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7db9ae0a9e218e11820170c08ec4afa1 SHA-1: e3297267fbcdc8b648e3c7802b8c087d36f496c9 SHA-256: 650a88c73fa960fd81b160222ccfb8ce40fa7555d5207371acad389d5a12d5d9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. The document body text, while appearing to be about medication administration, is heavily obfuscated and contains embedded URLs. This suggests a link farm or redirection scheme designed to lead users to malicious content or phishing sites. The ML classifier strongly indicated maliciousness.

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://dmfloriculture.org/uploads/1/3/0/6/130639076/130639076.html#regla+de+los+5+correctos+en+la+administracion+de+medicamentos
    • http://grupoefad.com/uploads/1/3/0/5/130541443/4997926.pdf
    • http://ableprojectservices.com/uploads/1/3/0/5/130551696/a784336994183b5.pdf
    • http://majorrobot.net/uploads/1/3/0/7/130776836/koseneruzibonuk-mebipepelur-dumafuziraji-viruxiloj.pdf
    • http://lemonews.com/uploads/1/3/0/5/130590413/lolijo-gedeverinupafej-vajibolovavi.pdf
    • http://backandbarberingstudio.ca/uploads/1/3/0/7/130739662/b3d4dcc.pdf
    • http://lunchmatrix.com/uploads/1/3/0/6/130620859/zadanomupe_lulajowineraf_morij_gotugujibaso.pdf
    • http://ulash.store/uploads/1/3/0/6/130620996/sufabawosuvep-mititu-ripub.pdf
    • http://jewelleryforgentlemen.com/uploads/1/3/0/6/130640040/bemidumibusixi_puzirukiwujun_gekekizojef.pdf
    • http://tumbledown-cottage.co.uk/uploads/1/3/0/6/130605312/lezokijofitilasexoru.pdf
    • http://futurecitywny.org/uploads/1/3/0/6/130604010/5f368e91.pdf
    • http://www.myartisanpool.com/uploads/1/3/0/3/130323285/20cf071425.pdf
    • http://casperoilfield.com/uploads/1/3/0/2/130289333/jexofutivogiseb.pdf
    • http://msmaco.com/uploads/1/3/0/6/130604924/5857e9183886.pdf
    • http://bluepalmtoo.com/uploads/1/3/0/4/130435745/pamimafa.pdf
    • http://elisespointe.com/uploads/1/3/0/6/130640048/e52f0.pdf
    • http://gbnbixby.com/uploads/1/3/0/5/130543766/nanep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000091d4.bin
6f7ba11a557de1335601280505fcce3227e23465527116f7f0f249c119683068
pdf-font-stream PDF embedded font (sfnt) at offset 0x91D4 9892 bytes
font_01_sfnt_off0000b518.bin
e2a609504f31aba74360c8f97aead3d8f97c76e888a653261413c8bef59e3205
pdf-font-stream PDF embedded font (sfnt) at offset 0xB518 2884 bytes