Malicious PDF — malware analysis report

Static analysis result for SHA-256 931e15c69d036212…

MALICIOUS

PDF

58.7 KB Created: 2020-03-07 15:05:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cd0391e37e104b4123c0145152e57ce2 SHA-1: bb4a960da487472a66abb9171e9e087992fbb41e SHA-256: 931e15c69d036212d0b0ede83846f715196f0b0c260c927fc74d4bcb719f50a4
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious sites. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are also listed in the extracted URLs, reinforcing the link farm attack pattern. No scripts were extracted from this sample.

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://adsl-63-204-18-58.benefitplans.org/uploads/1/3/0/7/130775649/130775649.html#pronoms+personnels+exercices+en+ligne
    • http://mypricelesspetals.com/uploads/1/3/0/4/130488861/bojirazozenexo.pdf
    • http://www.qigongfirenze.com/uploads/1/3/0/2/130288549/jedeguguzuwowop_fitizuzeloke_nubusomadalon.pdf
    • http://itldo.net/uploads/1/3/0/4/130489649/822200.pdf
    • http://hrs-horses.co.uk/uploads/1/3/0/5/130539348/866671c9.pdf
    • http://sonsetministries.com/uploads/1/3/0/5/130550706/kekafudorer-rapifiduku.pdf
    • http://www.waxdonkey.com/uploads/1/3/0/3/130323996/9020071.pdf
    • http://www.she-techs.com/uploads/1/3/0/7/130775740/fesojexa.pdf
    • http://www.achickandherpeas.com/uploads/1/3/0/7/130738909/mosikuzirogiwixita.pdf
    • http://badladyflicks.com/uploads/1/3/0/4/130489241/lesuza.pdf
    • http://biharvidyapith.com/uploads/1/3/0/7/130776169/logokavusewugogat.pdf
    • http://southlandbaptisttemple.net/uploads/1/3/0/6/130620267/zudipos.pdf
    • http://alamance-cba.com/uploads/1/3/0/7/130775923/823d135b70.pdf
    • http://www.affialiateprogram.net/uploads/1/3/0/5/130546434/7900ce9233a3c.pdf
    • http://multifaithstorytelling.org/uploads/1/3/0/2/130289553/bovixaf.pdf
    • http://www.simixlaundry.com/uploads/1/3/0/3/130313054/pajulep.pdf
    • http://mailbear.org/uploads/1/3/0/4/130483184/zofanor.pdf
    • http://1simpledownload.com/uploads/1/3/0/7/130775186/230132.pdf
    • http://mollymauied2013.com/uploads/1/3/0/6/130604644/givofipuk_zatajobokugo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009695.bin
6dde9685e9b2b68e9040f519d009a9c5d12b650a325833d8f8c94f4da5f4f394		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9695 11160 bytes
font_01_sfnt_off0000bc01.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC01 2652 bytes
font_02_sfnt_off0000c56a.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC56A 16204 bytes

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