Malicious PDF — malware analysis report

Static analysis result for SHA-256 648c50f5f755d5ca…

MALICIOUS

PDF

44.1 KB Created: 2020-05-23 22:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f1e9086813a06a0c102974eb7cd7173 SHA-1: be5930a71f996eca7e4393ec44a2608cd01d2888 SHA-256: 648c50f5f755d5cad81e9eb11f0a3489e6d333e04e436a17dad227915f640552
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 likely lead to malicious content or further malware distribution. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document's structure and embedded links suggest a phishing or malware distribution attempt.

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://a8yulechengzuixingonggao.br3h.com/uploads/1/3/0/6/130620916/130620916.html#linux+essentials+for+cybersecurity+p
    • http://verticalsandboxproductions.com/uploads/1/3/1/3/131380688/c0ecf490d.pdf
    • http://redlaceindustries.com/uploads/1/3/0/4/130476203/sedovafeki.pdf
    • http://resonant-worlds.org/uploads/1/3/0/9/130969616/sosat.pdf
    • http://angelsblessings.net/uploads/1/3/0/4/130488994/3dc6f.pdf
    • http://africanimmigrantfamily.org/uploads/1/3/1/4/131405976/712024576033dc.pdf
    • http://jerdoninnovations.net/uploads/1/3/0/5/130539934/sazezanukikizaduxa.pdf
    • http://robertsragdolls.com/uploads/1/3/0/2/130288909/e9a48394.pdf
    • http://ucruv.com/uploads/1/3/1/3/131398069/givexu.pdf
    • http://campandstudy.us/uploads/1/3/0/5/130539645/bolirugisisope.pdf
    • http://851trafalgar.com/uploads/1/3/0/2/130287727/mopopeme.pdf
    • http://therecruitingschool.com/uploads/1/3/0/4/130483911/2985684.pdf
    • http://yilaga.org/uploads/1/3/0/2/130273896/xumubobogite_duvodo.pdf
    • http://74-123-79-86.mgwnet.com/uploads/1/3/0/7/130775729/2dd94730d3.pdf
    • http://uretechinc.com/uploads/1/3/0/7/130776405/7667023.pdf
    • http://ninaceledonio.com/uploads/1/3/1/6/131637558/c91645f2c7a3c7.pdf
    • http://dunonline.org/uploads/1/3/1/4/131438211/b660db1fe8.pdf
    • http://jbestportfolio.com/uploads/1/3/1/4/131453256/fizis.pdf
    • http://eurythmy-at-home.com/uploads/1/3/0/7/130776460/jadej.pdf
    • http://pernine.com/uploads/1/3/1/6/131636872/3ccd72087899d.pdf
    • http://solarpowermidatlantic.net/uploads/1/3/0/5/130551112/2307035.pdf
    • http://nhanquamomo.online/uploads/1/3/0/4/130488513/1c8171e.pdf
    • http://managesky.com/uploads/1/3/1/4/131437655/6608459.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • 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_off00006bd1.bin
229090bb7b3cd5ac6264b9e566da555dca58841d03b2a43d3c68e6591f04fc60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD1 10164 bytes
font_01_sfnt_off00008e8d.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8D 16204 bytes

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