Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55de6ca6fa54085…

MALICIOUS

PDF

38.5 KB Created: 2020-03-09 09:05:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1f9b7869951b5b4c94ae99ac4164ea7b SHA-1: 59f08ebb71f8edcb183c18cdac64fdc66326906c SHA-256: c55de6ca6fa54085afb787b0b90a243d5aaa6ff8112638518490577bec189470
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains a reference to a 'good letter of recommendation' and includes the primary URL, suggesting a lure to potentially malicious or SEO-spam content.

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://74-123-78-3.mgwnet.com/uploads/1/3/0/7/130776022/130776022.html#good+letter+of+recommendation+for+internal+medicine+residency
    • http://specialife.com.cn/uploads/1/3/0/6/130621382/lepawafilexux.pdf
    • http://closinggoals.com/uploads/1/3/0/8/130874490/guzuseridawaj_mojez_finin.pdf
    • http://openmasajes.net/uploads/1/3/0/3/130313595/3cd22a79157861.pdf
    • http://mindfulnessmatters.online/uploads/1/3/0/7/130739027/4878109.pdf
    • http://ns2.pleasingfood.com/uploads/1/3/0/6/130604615/rusetenubenir.pdf
    • http://shannonmarieryan.com/uploads/1/3/0/7/130775288/muzoj.pdf
    • http://sharepowder.com/uploads/1/3/0/3/130313463/4f7abfc2e2b43e.pdf
    • http://citylimitshairstudio.com/uploads/1/3/0/4/130476587/sazafetelu.pdf
    • http://nokia-review.com/uploads/1/3/0/5/130590545/b9980356db4b93.pdf
    • http://tomlinsonoutdoors.com/uploads/1/3/0/2/130289696/manimudozinax.pdf
    • http://www.cravencaravans.co.uk/uploads/1/3/0/8/130814303/6473246.pdf
    • http://propertyinstyle.net/uploads/1/3/0/8/130815381/8956411.pdf
    • http://gizatzen.net/uploads/1/3/0/7/130775685/7846679.pdf
    • http://cookinglivinggiving.com/uploads/1/3/0/6/130603827/9cc59ac942e7c74.pdf
    • http://franconiapro.com/uploads/1/3/0/4/130435679/fogerupekez-zafesolegaxet.pdf
    • http://youthfulskindoctors.com/uploads/1/3/0/2/130274098/luwitevikosed.pdf
    • http://studiobrickhouse.net/uploads/1/3/0/5/130588567/gejozatabosefo.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_off00006e1d.bin
5d62686b43f35625257ba7291152eec6a495804496d15664044309b8dadc2ebe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1D 7884 bytes

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