Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca24c7ce089497e…

MALICIOUS

PDF

95.6 KB Created: 2020-04-20 12:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 55dc3b85cce4d5adcbb218dd793c7151 SHA-1: 62a73e91bcc18dfab8384cb95ff644ede2767116 SHA-256: 0ca24c7ce089497ed925bf2eb6a9498df48376e893d528495eab20636497e8f0
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, indicating a link farm designed to host malicious content. The ML classifier strongly suggests malicious intent. The embedded URLs are likely used to redirect users to further malicious sites or downloads.

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://actingupchildrenstheatre.com/uploads/1/3/0/5/130590366/130590366.html#neoclassical+theory+of+management+pdf
    • http://noispy.com/uploads/1/3/0/5/130588206/28e67b66c3420.pdf
    • http://outstridecoffeeco.com/uploads/1/3/1/4/131453016/3818897.pdf
    • http://diaryofafitgirl.com/uploads/1/3/0/4/130435524/ketuledi.pdf
    • http://thomwoodwagyu.com/uploads/1/3/0/7/130740046/9563017.pdf
    • http://thehempfox.com/uploads/1/3/0/5/130588716/komikutitoteno.pdf
    • http://4point0tech.net/uploads/1/3/0/5/130551427/5402659.pdf
    • http://wicklowpartners.com/uploads/1/3/0/5/130544090/kawaxoduma.pdf
    • http://atmosfunds.com/uploads/1/3/0/7/130738578/0d80517aae4d6.pdf
    • http://mannatechachievers.com/uploads/1/3/1/4/131438171/7769534.pdf
    • http://unstoppableunit.com/uploads/1/3/0/5/130589454/8657303.pdf
    • http://mobolayeinc.com/uploads/1/3/1/3/131379971/wovili.pdf
    • http://elimhouseofworship.com/uploads/1/3/0/4/130483650/tibetix.pdf
    • http://online-income-stream.com/uploads/1/3/0/3/130379391/fabuw.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://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_off00013e4e.bin
a0028a315b3aa56bb84390183a24bb3c12c17afb5d2b72c195e318f38ca4afd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4E 7824 bytes
font_01_sfnt_off00015c8e.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C8E 16036 bytes

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