Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5f1f40be5568e5…

MALICIOUS

PDF

51.1 KB Created: 2020-06-12 01:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcd8bf7e8ad45337e5722fd7c526c871 SHA-1: 0eafce483555bb54703339e80c9e9c5c2bfa01b7 SHA-256: ce5f1f40be5568e54be063708d40aac0a58d88ea41fa58dcc2cf62d4fa21825a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a tutorial. The presence of a PDF link farm heuristic further supports the malicious intent of distributing links to potentially harmful content.

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://wuiv.org/uploads/1/3/0/2/130271184/130271184.html#white+background+product+photography+tutorial
    • http://veraconsultingstaffing.com/uploads/1/3/0/5/130539095/3665464.pdf
    • http://alexanicolebooks.com/uploads/1/3/0/3/130323794/buwikazajo_dazakezuj_ziwibatede_fudupin.pdf
    • http://spartancork.com/uploads/1/3/0/6/130604369/1494907.pdf
    • http://4cj.undesirable.us/uploads/1/3/0/7/130776007/d2e71ee7244a36.pdf
    • http://dfhak.com/uploads/1/3/1/3/131383864/tisegu.pdf
    • http://katiegracecollins.com/uploads/1/3/0/7/130776452/vijowodunojofe_fanuza_xifazozodora.pdf
    • http://greatlakeswildlife.com/uploads/1/3/0/6/130604824/gumuru.pdf
    • https://wolidufi.files.wordpress.com/2020/06/kimupadiwobolavolupup.pdf
    • https://kumitewefa.files.wordpress.com/2020/06/49581575897.pdf
    • https://bujadite.files.wordpress.com/2020/06/52092498878.pdf
    • https://kozujatuvi.files.wordpress.com/2020/06/jeramomo.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_off0000901b.bin
7f38c7bd3076d5ec567b373f8788658f617417f44aeaffad1c2d563936ecbb0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x901B 2268 bytes
font_01_sfnt_off00009a2a.bin
78a894f043aec6c7a5a256b6b156f3524b62ae07fbce3b3bfd430da101b94798		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A2A 11172 bytes

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