Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c19c3af44740182…

MALICIOUS

PDF

36.3 KB Created: 2020-03-06 16:00:10 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e5be2cdd003a3e01e3f2067230b201ba SHA-1: 684572e889f6a886fcc17a717b98511bc630fb72 SHA-256: 1c19c3af4474018250579bed1c02cbaf6d7901f1e0fe674de3518da863415019
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated and contains what appears to be junk data, but the presence of URLs like 'http://smbrandmgt.com/uploads/1/3/0/7/130740133/130740133.html#bubble+sort+cobol+array' and 'http://www.glhcleaningpros.com/uploads/1/3/0/6/130639548/7085523.pdf' suggests a link farm or redirection strategy.

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://smbrandmgt.com/uploads/1/3/0/7/130740133/130740133.html#bubble+sort+cobol+array
    • http://www.glhcleaningpros.com/uploads/1/3/0/6/130639548/7085523.pdf
    • http://robertpwendell.org/uploads/1/3/0/7/130776498/4976258.pdf
    • http://supergise.com/uploads/1/3/0/6/130604140/nefulubovok-girugad-tikesum-jubedisim.pdf
    • http://ontariocaairporthotel.com/uploads/1/3/0/8/130873961/a84b0067f3c.pdf
    • http://thecampcoach.net/uploads/1/3/0/5/130589108/lelirafududedira.pdf
    • http://shadowbendtest7.com/uploads/1/3/0/6/130621431/73800b.pdf
    • http://popuppads.com/uploads/1/3/0/3/130313686/85b0ca5046d.pdf
    • http://perfectlyimperfectpiecespa.com/uploads/1/3/0/3/130323328/weduleguju.pdf
    • http://beautyefx.com/uploads/1/3/0/2/130289179/8a3a1cfccbd9.pdf
    • http://miomondo.com.au/uploads/1/3/0/2/130291433/vuxilarolajewawefe.pdf
    • http://crafted-by-yaime.com/uploads/1/3/0/4/130476089/3d1221a5bbe6d.pdf
    • http://theblondefro.com/uploads/1/3/0/6/130620759/e68aa4d8469cbc.pdf
    • http://alumbite.org/uploads/1/3/0/8/130874104/4683dda.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_off00006663.bin
207f4d262a50659b3a670abcb269cab19dc6d8f7395fb016fcd76f535e69cf65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6663 7640 bytes

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