Malicious PDF — malware analysis report

Static analysis result for SHA-256 17be7f6eea24b3d6…

MALICIOUS

PDF

31.6 KB Created: 2020-04-12 21:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d49170f51446b7415e4c7513ee82ca71 SHA-1: 02dd63e29dab987d0e87ebe5f9f8f41fa64112b5 SHA-256: 17be7f6eea24b3d6d27ab88fc126404c11426e3ab2b14d9c27c6c78efa32323a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to other PDF files on various domains, which is indicative of a link farm or a method to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect the user to potentially harmful content or engage in SEO manipulation.

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://vossboxaffaires.ca/uploads/1/3/0/6/130639559/130639559.html#suzuki+book+4+violin+songs
    • http://customportraitartists.com/uploads/1/3/1/1/131163578/97ac3ba1a2bdd4d.pdf
    • http://realtor-squared.com/uploads/1/3/0/6/130640078/pekolesorozapisiv.pdf
    • http://texsunwindowtint.com/uploads/1/3/0/3/130313641/jodaxozumuwunow_zenisonapike_jejisekujili_jamige.pdf
    • http://brisellsbling.com/uploads/1/3/0/2/130288483/6490652.pdf
    • http://321floors.com/uploads/1/3/0/7/130775527/wesog.pdf
    • http://hospes.shop/uploads/1/3/0/5/130539888/donewedowukoxoj_kefifose_mekezewas.pdf
    • http://lomaswalker.com/uploads/1/3/1/4/131453060/7154545.pdf
    • http://ikwildieboot.nl/uploads/1/3/1/3/131383227/depenegof.pdf
    • http://lturnerandassociates.com/uploads/1/3/0/6/130605146/043dc11de4.pdf
    • http://joshuasimon.net/uploads/1/3/0/5/130551505/7443323.pdf
    • http://perfectdrawer.com/uploads/1/3/1/3/131383674/pitox.pdf
    • http://akeywestwedding.com/uploads/1/3/0/6/130604756/5757920.pdf
    • http://creativecasemanagementinc.net/uploads/1/3/0/7/130776619/pegujelanuwizi_galudogex_jaduwebamuweri_zodep.pdf
    • http://shotlistshow.com/uploads/1/3/1/4/131437573/6462400.pdf
    • http://interiordesignbyluxe.com/uploads/1/3/1/4/131411281/juvukevemori.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005587.bin
6aba1cc617c30748a129d7e15bb55c21fc7fe2ad7d58ca0981cbeaa89d2bfc44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5587 7308 bytes

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