Malicious PDF — malware analysis report

Static analysis result for SHA-256 0748fe19626508f3…

MALICIOUS

PDF

47.3 KB Created: 2020-05-23 18:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c90e5fdb47cd895d662f4f048f78414 SHA-1: d8944ef428a825b4f61792a150ca740dbbe62808 SHA-256: 0748fe19626508f335deaf7735e6f385ba46c8adf14adcf23c0b0c7d36940281
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files, suggesting a link farm or redirection mechanism. The document body mentions 'Bytefence license key 2016', indicating a lure to trick users into downloading potentially malicious software or accessing malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://3oh.undesirable.us/uploads/1/3/1/4/131453501/131453501.html#bytefence+license+key+2016
    • http://stationaryfulfill.com/uploads/1/3/1/3/131382797/c399696284.pdf
    • http://clockworkcatdesigns.com/uploads/1/3/0/2/130289185/timad_muzuw_dukose.pdf
    • http://cardinalbodyart.com/uploads/1/3/1/1/131164278/virufop.pdf
    • http://kindsugar.com/uploads/1/3/0/5/130588672/bupojeneru_jovareni_dodezasojopimi_firugubo.pdf
    • http://ravenblackdoll.com/uploads/1/3/0/6/130620202/0e3cc.pdf
    • http://lacaladesign.com/uploads/1/3/0/8/130814284/dubemer-guronofad.pdf
    • http://corporateeventphoto.com/uploads/1/3/0/5/130589397/fomuzirej-ragin-mugiv-bujuro.pdf
    • http://ctxpools.com/uploads/1/3/1/3/131380399/8851097.pdf
    • http://changeadeptness.com/uploads/1/3/0/9/130969225/fcc43.pdf
    • http://hhfsl.org/uploads/1/3/0/7/130738657/feraja-xovufitak-nirefus-lekotek.pdf
    • http://mtpwellness.com/uploads/1/3/0/7/130774979/jomogug_sekisuker_dugobowunele.pdf
    • http://lpproperty.co.uk/uploads/1/3/1/0/131070722/rudizik_fevemuxubodejo.pdf
    • http://adammatta.com/uploads/1/3/0/7/130739340/d679513194.pdf
    • http://i-wonder-land.com/uploads/1/3/1/6/131606434/1048111.pdf
    • http://astitchbetweenfriends.com/uploads/1/3/1/8/131856234/1802965.pdf
    • http://onesmallfarmer.com/uploads/1/3/0/9/130969079/4c3845b6564c64b.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/
    • http://scripts.sil.org/OFL
    • 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_off00007809.bin
f643035020fd91143fbe51b11756e6e2f08c86ebc27604d9392419729269189c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7809 10784 bytes
font_01_sfnt_off00009cf7.bin
e1a5845628cbac55ef6a65fb1649e88b2743f343f4c7cb038a455aba978d27c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF7 16076 bytes