Malicious PDF — malware analysis report

Static analysis result for SHA-256 79aabd63bc57b15d…

MALICIOUS

PDF

36.0 KB Created: 2020-06-10 07:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6fec7058a302b730d77cbbe47de2b22 SHA-1: 0dcb60942e6947011de14e02e3b4315531fa70cf SHA-256: 79aabd63bc57b15de18017561611beab86afa7284fbee37bd1b9950d4c413800
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic suggests this is a link farm designed to distribute malicious content. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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://sslvpn.5starbuild.com/uploads/1/3/1/4/131455621/131455621.html#lucy+2+t%25C3%25BCrk%25C3%25A7e+dublaj+indir
    • http://shop.chirogust.be/uploads/1/3/0/6/130621840/5816566.pdf
    • http://pasticware.com/uploads/1/3/1/3/131379536/gowox_zapajeseni.pdf
    • http://webdisk.cakeballsforacause.com/uploads/1/3/1/4/131437722/gesotuvalasubefela.pdf
    • http://mail.brissaeden.com/uploads/1/3/0/6/130604512/8302192.pdf
    • http://itsgreattobealive.net/uploads/1/3/1/4/131483550/52511ec2.pdf
    • http://vickyblog.info/uploads/1/3/0/7/130739778/pepim-sukarugise-bisobikisew-zogalemazi.pdf
    • http://susanpultman.com/uploads/1/3/0/7/130739445/nevitak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://gozinogix.files.wordpress.com/2020/06/fawomuwe.pdf
    • https://liruxevilo.files.wordpress.com/2020/06/wanipapabajavaf.pdf
    • https://xopaxutije.files.wordpress.com/2020/06/39553127703.pdf
    • https://xopaluwefaje.files.wordpress.com/2020/06/rakeladuxuwafasu.pdf
    • https://dozobozugut.files.wordpress.com/2020/06/xuposig.pdf
    • https://boxubiriso.files.wordpress.com/2020/06/40844946874.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://www.imdb.com/title/tt2872732
    • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059eb.bin
4f4e2d090be9aa1ce5d6628bdffc2d66ce5610b368d1eb34230f04e841bdd597		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59EB 13576 bytes

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