Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cabc23c53673de…

MALICIOUS

PDF

40.7 KB Created: 2020-03-29 10:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 749eb6d75a67133a883aa3ebd900d41c SHA-1: ab2f8a768b2bb970e83a80b58daf752144abaca9 SHA-256: 15cabc23c53673de71674f2e4d4b1c6f72d2c6eb17ae9014994c254cd9138b19
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the embedded URLs are the primary indicators of malicious intent, likely serving as a lure or a distribution point for further compromise.

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://bailigongyulechengshoujiban.br3h.com/uploads/1/3/0/7/130738700/130738700.html#lista+do+participio+passado+dos+verbos+em+ingles
    • http://rxlvnd.net/uploads/1/3/0/5/130589430/wemufidewagiw_bopukozuxezele_korigizinaz.pdf
    • http://sanbernardinopestpros.com/uploads/1/3/0/9/130969190/vaximeviris-kefifuzel.pdf
    • http://passion4totalwellness.net/uploads/1/3/0/5/130588565/0aad992ff20a94.pdf
    • http://immyownentourage.com/uploads/1/3/0/5/130543656/9087437.pdf
    • http://willowtophempfarm.com/uploads/1/3/0/3/130323968/6162716.pdf
    • http://lecaininenterprisesllc.com/uploads/1/3/0/5/130551091/zatov_xefutavibexigu.pdf
    • http://solarnemcap.com/uploads/1/3/0/7/130775223/vidifalenimizidawivi.pdf
    • http://premium-phytonutrients.com/uploads/1/3/0/3/130379718/4704159.pdf
    • http://shannoncallarman.com/uploads/1/3/0/7/130739223/rigama-vanum.pdf
    • http://mudgleyholidayhouse.com/uploads/1/3/0/7/130775198/pudufatagab.pdf
    • http://moneyyearone.com/uploads/1/3/0/8/130813982/f3e9a3476f942.pdf
    • http://boganesque.com/uploads/1/3/0/6/130621013/firoritogamen_zosutagapedare_mamuzudadiw_jozupebitifepul.pdf
    • http://foodeventsdenver.com/uploads/1/3/0/7/130739012/727054.pdf
    • http://www.atari2600homebrew.com/uploads/1/3/0/6/130605030/9363189.pdf
    • http://www.breathingimagesphotos.com/uploads/1/3/0/6/130639418/12222.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_off00007212.bin
9a781d5a113e6b174fd8ae943d1fbffe8199e3eb7991e2604293e47f99e7cc36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7212 9996 bytes

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