Malicious PDF — malware analysis report

Static analysis result for SHA-256 713e5084d8c28e5a…

MALICIOUS

PDF

29.1 KB Created: 2020-06-12 03:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 128a1336a8c169a9e9dd480494c15173 SHA-1: 727b61eb068b63d58c2b5e0c3eb7023a244e5943 SHA-256: 713e5084d8c28e5ac42e577df4de40d00c048773db46e8766ee1888c55a3e2e9
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the sheer volume of external links indicates a likely attempt to redirect users to potentially malicious content or phishing pages.

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://portfoliobyjordan.com/uploads/1/3/1/8/131872238/131872238.html#lotus+notes+8.5.2+user+guide
    • http://4rr.undesirable.us/uploads/1/3/0/6/130621089/zexevilug.pdf
    • http://honourthyking.com/uploads/1/3/0/7/130775730/95ef3c5c7fcc7.pdf
    • http://lovejewellery.org.uk/uploads/1/3/1/6/131636584/jebopudozopani_kumogik_gajavipi_nibulevelilopaf.pdf
    • http://colinpierce.com/uploads/1/3/1/8/131857920/verolavekirubof.pdf
    • http://webmail.joshuaschubart.com/uploads/1/3/0/6/130640220/ba25c5.pdf
    • http://store.transformyourmarriagetoday.com/uploads/1/3/1/3/131381531/jukowikexiva.pdf
    • http://gracelifecollege.org/uploads/1/3/0/5/130540146/sugijerodasogos.pdf
    • http://yulebacreekstockhorses.com/uploads/1/3/0/6/130639203/4903387.pdf
    • http://appllancepro.com/uploads/1/3/0/7/130738662/mabefaruxagigasakaso.pdf
    • http://deltocororo.com/uploads/1/3/0/6/130621178/niduru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://gunamitiluj.files.wordpress.com/2020/06/30282557939.pdf
    • https://kijomevoduno.files.wordpress.com/2020/06/xojuwivivaposo.pdf
    • https://nibefuwubewa.files.wordpress.com/2020/06/628089795.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c26.bin
ddf20bab84b739925924defc3514b5692b6ac7d94ab0232de12e5598d244982b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C26 8512 bytes

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