Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf354c877587ad9…

MALICIOUS

PDF

37.1 KB Created: 2020-03-22 09:48:12 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1d3862000188d66dd0cf5d3b0bb48b86 SHA-1: 4cb84bdb2d239d38c06025b1545308accbc907a0 SHA-256: aaf354c877587ad9358535cd5640df168d6d8f921ff637a2392e7191f3c221d2
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to 'Ejercicios matematicas sexto de primaria pdf' and includes URLs pointing to various domains. These URLs likely serve as a link farm or a distribution point for further malicious content, aiming to manipulate search engine results or trick users into downloading additional payloads. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this file.

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://grillou.fr/uploads/1/3/0/6/130620853/130620853.html#ejercicios+matematicas+sexto+de+primaria+pdf
    • http://oregonluxuryhome.com/uploads/1/3/0/5/130588983/jofatazofefe.pdf
    • http://cpanel.freestylecandles.com/uploads/1/3/0/8/130814340/7916232.pdf
    • http://bameblogwithess.com/uploads/1/3/0/6/130620764/mekomepekosanav-sevizimeb-lenusolixopo.pdf
    • http://pnxpartners.com/uploads/1/3/0/3/130313345/1097226.pdf
    • http://mineviewaero.com/uploads/1/3/0/7/130739732/3695811.pdf
    • http://www.realitybitesfestival.org/uploads/1/3/0/2/130272328/siwide.pdf
    • http://www.ceresevents.org/uploads/1/3/0/2/130287839/gigizuligirid_vogidejo_siziluronene.pdf
    • http://rabbirenee.com/uploads/1/3/0/5/130588980/jovem.pdf
    • http://tristarconstructioninc.com/uploads/1/3/0/2/130274151/zituvarapoxarur.pdf
    • http://mta-sts.mail.plantgrowthchambers.com/uploads/1/3/0/6/130620885/dexofuduziv.pdf
    • http://navarrepenthouse.com/uploads/1/3/0/6/130620423/6394223.pdf
    • http://athenamechanicalsupply.com/uploads/1/3/0/3/130379427/tefelazovezage_lalilijasotufin.pdf
    • http://lornasartandcraft.com/uploads/1/3/0/4/130483351/8115582.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_off00006590.bin
75bec7d68c2323a67e292540522172252fc29c00c93499a988f73d9e35ad6fdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6590 8860 bytes

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