Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c289555acab5e28…

MALICIOUS

PDF

45.4 KB Created: 2020-04-11 09:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f8b8c3c296c0989e1ee2eb22651baa7c SHA-1: b1a4e15ed8a70c2cfff41544f98daab6abaa2bd3 SHA-256: 3c289555acab5e2800d2ff41ad26c8b69c6336a6b152d37e5001c6b0ac868b02
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, many of which point to other PDF files hosted on various domains. The primary external URI found is http://74-123-72-249.mgwnet.com/uploads/1/3/0/5/130550781/130550781.html#ddowiki+prove+your+worth. This suggests a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://74-123-72-249.mgwnet.com/uploads/1/3/0/5/130550781/130550781.html#ddowiki+prove+your+worth
    • http://stjamesmilwaukee.org/uploads/1/3/0/6/130621591/9035224.pdf
    • http://tshmfoundation.org/uploads/1/3/1/3/131384539/8bba44.pdf
    • http://empireofdata.com/uploads/1/3/0/9/130969199/dukedopoxo_bopizevanegu.pdf
    • http://reasonable-person.com/uploads/1/3/0/2/130289279/852177.pdf
    • http://prolificdreams.net/uploads/1/3/0/4/130489727/jesikemo.pdf
    • http://variedadescontreras.com/uploads/1/3/0/6/130603834/rigaked_wavegilufix.pdf
    • http://nowaysir.com/uploads/1/3/0/5/130542872/xubozig-rojisiraxamuras.pdf
    • http://healingsigns.org/uploads/1/3/0/8/130874183/a558d80365.pdf
    • http://einspardmm.com/uploads/1/3/0/6/130620402/gojuvuwobusos-funofofineguve-todurut-povalu.pdf
    • http://julfcave.net/uploads/1/3/1/3/131380759/d063b39a2472b6c.pdf
    • http://purchases4apurpose.org/uploads/1/3/0/5/130588556/jajune_janig_sosamivej.pdf
    • http://horsenfefferhobbies.com/uploads/1/3/0/4/130477890/vevodori.pdf
    • http://monamourhair.com/uploads/1/3/1/4/131452842/bevej.pdf
    • http://purchases4apurpose.org/uploads/1/3/0/5/130588556/
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d5e.bin
7bb5645f8bdbfba349d8fc1d187193b9681d188ff3848a4b000b25eb5197931c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D5E 8588 bytes
font_01_sfnt_off00009e37.bin
93d18b0406e48a3281d281d937c8204c59d1f1c7e5b52ef70c8eadb0d5a5e000		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E37 3328 bytes

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