Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb086aa7b2311f59…

MALICIOUS

PDF

44.1 KB Created: 2020-03-22 05:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f55172c949c9c389c279b056f700acd8 SHA-1: 8773cb355c26a455145d92ddfbb73b755a10aa26 SHA-256: eb086aa7b2311f59b49c54e0acd65ae4ff527b363b7a5f3fe1fe77569e18f87b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by an ML classifier. It contains a large number of external links, many pointing to other PDF files with numeric or generic slugs, indicative of a link farm or SEO manipulation tactic. The document body, though partially corrupted, contains references to 'Movimiento parabolico ejercicios pdf' and the authoring application 'wkhtmltopdf', suggesting a lure document. The primary attack pattern involves directing users to a multitude of external URLs, potentially for hosting further malicious content or for SEO poisoning.

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://pencilpenservices.com/uploads/1/3/0/7/130739183/130739183.html#movimiento+parabolico+ejercicios+pdf
    • http://miwoori.net/uploads/1/3/0/6/130639603/guzekogugebike-punosireni-gugebajujeri.pdf
    • http://heroicdecay.com/uploads/1/3/0/5/130541346/fisunusi-tigikakovoxu.pdf
    • http://internet-savvy.com/uploads/1/3/0/7/130776111/6032961357e63.pdf
    • http://www.nicholsoninnovations.com/uploads/1/3/0/6/130621369/naradov.pdf
    • http://www.markopaulo.net/uploads/1/3/0/2/130274330/zudapobipa_rivolupaviv.pdf
    • http://educationfusion.org/uploads/1/3/0/5/130545097/c73947e0c6f.pdf
    • http://pctla.org/uploads/1/3/0/7/130776388/a108d14943f8.pdf
    • http://sacredheartpri.com/uploads/1/3/0/5/130550936/2307230.pdf
    • http://rebelrosiechildrensboutique.com/uploads/1/3/0/5/130539231/673a9.pdf
    • http://mta-sts.leftradialsupport.com/uploads/1/3/0/5/130551087/2070370.pdf
    • http://kellyskreationsny.net/uploads/1/3/0/8/130874183/d2a44432d8f.pdf
    • http://restoreand.com/uploads/1/3/0/5/130550697/74be1.pdf
    • http://plainenglishfordoctors.com/uploads/1/3/0/5/130551206/xomuz.pdf
    • http://armelleaurelien2019.com/uploads/1/3/0/3/130313634/527543.pdf
    • http://pronoiastudios.com/uploads/1/3/0/6/130639140/tuwisexafidon.pdf
    • http://fri.center/uploads/1/3/0/4/130476098/6082315.pdf
    • http://leffet.fr/uploads/1/3/0/2/130289173/dewewek_jadovupavavonu.pdf
    • http://matrixcarpetbinder.com/uploads/1/3/0/4/130476579/e47920cddd466.pdf
    • http://mesmerdeleault.com/uploads/1/3/0/6/130605426/lebujezivokeza-ruvegej-gakusiraluzujaj-fagilupagaviwin.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_off0000762f.bin
8b3c1335c821a150e2552f32c7617563da17ca3afeea0213322381d823ceea2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762F 9476 bytes
font_01_sfnt_off00009873.bin
59598b843c6dbbd6f844c712fc8ba0218f2c7fc8e8e5c3db32488020cf7f1801		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9873 2852 bytes

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