Malicious PDF — malware analysis report

Static analysis result for SHA-256 486024b57de85291…

MALICIOUS

PDF

40.6 KB Created: 2020-04-01 14:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d8d9b723d2623a49874587106c961337 SHA-1: bb6b8b145d49982fe292c840c08e2e1889c575ec SHA-256: 486024b57de85291059b0d4c4c183927b48306ac29d0bc8542452a8e6344059d
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, a technique often used for SEO poisoning or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to educational materials, suggesting a lure to disguise the malicious intent. The primary attack pattern involves directing users to a series of linked PDF documents hosted on various domains.

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://beaverdamchurchonline.org/uploads/1/3/0/2/130272462/130272462.html#spectrum+math+grade+5+answer+sheet
    • http://nursesdirectllc.com/uploads/1/3/0/7/130776629/9d191fc35dcdc8.pdf
    • http://www.reversac-traductions.com/uploads/1/3/0/4/130476310/pajazabu.pdf
    • http://eufrasiajewels.eu/uploads/1/3/0/7/130776230/katobaxupen.pdf
    • http://matthewkcompton.com/uploads/1/3/0/6/130620971/af068b3.pdf
    • http://becausegoodness.com/uploads/1/3/1/3/131380024/tutak.pdf
    • http://reenaoncanvas.gallery/uploads/1/3/0/8/130814208/1187863.pdf
    • http://toptreeservicerosevilleca.com/uploads/1/3/0/4/130488196/9880984.pdf
    • http://gageandlott.com/uploads/1/3/0/9/130969418/wubimu.pdf
    • http://campaignartwork.com/uploads/1/3/0/6/130621576/vaxodopogil_ligalu.pdf
    • http://tayloreco.com/uploads/1/3/0/7/130776316/towidubisid.pdf
    • http://boylangroup.info/uploads/1/3/0/6/130621798/5350494.pdf
    • http://2por20.com/uploads/1/3/0/7/130775743/1786094.pdf
    • http://ponyexpressgamez.net/uploads/1/3/0/4/130435503/miruwozalofu_tabunikev_xaxugin.pdf
    • http://vcdesigns.org/uploads/1/3/0/6/130621378/7578120.pdf
    • http://rosemattress.com/uploads/1/3/0/9/130968949/dekemazaranupebagud.pdf
    • http://austinsandford.com/uploads/1/3/0/6/130604955/jikevomopiwidige.pdf
    • http://boekinbinding.nl/uploads/1/3/0/7/130739978/28f49e40713.pdf
    • http://aspllcent.com/uploads/1/3/0/6/130621890/7066823.pdf
    • http://burnsbradshawllcrealtors.com/uploads/1/3/0/7/130775740/8732409.pdf
    • http://test-website-version.com/uploads/1/3/0/2/130289595/7355616.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_off00006c4f.bin
096e981efe2797b8a97694b0caea09b378af8aca06f28a0ee7807ed42a25dd69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4F 7500 bytes
font_01_sfnt_off0000899c.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x899C 2652 bytes

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