Malicious PDF — malware analysis report

Static analysis result for SHA-256 df003e25661104b5…

MALICIOUS

PDF

41.5 KB Created: 2020-03-24 20:52:01 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ef98966d028bf37306fdbb048e3a5d32 SHA-1: 9e23c9fee81b01e4537c4b28cf527ee64d43c4d7 SHA-256: df003e25661104b5390805bc58b6f544fd2eb6d16fdde0b6c123c658bbb35c85
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on different domains. This behavior is indicative of a link farm designed to host malicious content or to obscure the true destination. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm attack pattern.

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://briaoma.com/uploads/1/3/1/3/131380251/131380251.html#sunbeam+microwave+700+watt+manual
    • http://drmaryweiss.com/uploads/1/3/0/7/130775531/6a3968e12a7.pdf
    • http://michaelroll.net/uploads/1/3/0/5/130551331/miwojogo-banilape.pdf
    • http://shopjohnandtaylor.com/uploads/1/3/0/3/130323469/7553395.pdf
    • http://3mdentallab.com/uploads/1/3/0/6/130604342/kaxegebodujile.pdf
    • http://sunshinekidsdaycare.org/uploads/1/3/0/5/130544703/5226401.pdf
    • http://neotribes.net/uploads/1/3/0/6/130604521/ab5d9.pdf
    • http://tntlandscapingllc.com/uploads/1/3/0/5/130542729/4fd8a53704.pdf
    • http://amomilanoleather.com/uploads/1/3/0/3/130323302/gunek.pdf
    • http://thinkhappyvibehappy.com/uploads/1/3/0/6/130640051/0b32e241c14.pdf
    • http://iceberger.org/uploads/1/3/0/6/130621802/meroxiw.pdf
    • http://doorandwindowplus.com/uploads/1/3/0/5/130551162/c8d93.pdf
    • http://www.iphonerepairswiss.com/uploads/1/3/0/6/130621114/61472211e.pdf
    • http://thewinegentleman.com/uploads/1/3/0/8/130814197/juxupate_wetinapefenixar_bewuravu_ledajafanol.pdf
    • http://prathamut.org/uploads/1/3/0/8/130813518/7973112.pdf
    • http://www.pinkinprivate.com/uploads/1/3/0/6/130604983/808430.pdf
    • http://gr8waterinc.com/uploads/1/3/0/4/130491418/0389dfd8bb44.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fbe.bin
b07d3a3dcb65e0043387a5ede016fc3a504fada9f867973e2c33e27669254d1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBE 1784 bytes
font_01_sfnt_off00007818.bin
6d3a027dcc181277a1d9e6f862d3f1af16aa625372d7dd9cbfd9d6bf0c886cde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7818 8552 bytes

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