Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef14996b79d0daeb…

MALICIOUS

PDF

38.3 KB Created: 2020-03-08 13:05:01 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e7ad1a6f963e0538ec28afa26c1772c1 SHA-1: 60e96cb527a1620e7102d9b41ff30c00fe400a23 SHA-256: ef14996b79d0daeb662e4b3e0f0670564dcd2d949dcd023587554b95c8494d97
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, many of which point to other PDFs hosted on SEO-optimized domains. This suggests a link farm or redirection scheme designed to lead users to malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. No scripts were extracted from this sample.

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://irrj9w.salon225.com/uploads/1/3/0/7/130739750/130739750.html#adjective+clauses+restrictive+and+nonrestrictive
    • http://bottlecan.biz/uploads/1/3/0/2/130287506/1704559.pdf
    • http://nkbblockchain.com/uploads/1/3/0/8/130814993/digimewuni_genubenaj_jebamifitekig.pdf
    • http://2psp.fr/uploads/1/3/0/5/130551777/6007050.pdf
    • http://denvergranitedepot.com/uploads/1/3/0/7/130776571/9549707.pdf
    • http://www.parvizbagherzadeh.com/uploads/1/3/0/4/130483656/a16b3892948e71.pdf
    • http://dmnroundtable2020.com/uploads/1/3/0/6/130639995/jitukugejeramiwok.pdf
    • http://wadkinskennethrcpas.com/uploads/1/3/0/7/130776676/6147625.pdf
    • http://www.waimanalonobookingfee.com/uploads/1/3/0/6/130639641/fowetop.pdf
    • http://esteem-engineers.com/uploads/1/3/0/7/130774994/4116051.pdf
    • http://www.cedartowalnut.com/uploads/1/3/0/9/130969177/d79cb1d263.pdf
    • http://idtalentagency.com/uploads/1/3/0/8/130813366/ninexox.pdf
    • http://wethenorthshirts.com/uploads/1/3/0/4/130489898/vemaza.pdf
    • http://www.mybioproject.com/uploads/1/3/0/6/130639216/falejejojusesele.pdf
    • http://justinalfond.net/uploads/1/3/0/4/130476503/baa96f93227.pdf
    • http://nsfwmugshop.com/uploads/1/3/0/6/130622116/1681535.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_off00006d83.bin
14090f8a0cf0d6183705de0cb0b3679be54181fe486c95deb559b726a9e67e62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D83 7656 bytes

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