Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3582e828b29d5b…

MALICIOUS

PDF

38.7 KB Created: 2020-03-29 02:31:08 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 307511514a057a5e5430e8b848a50695 SHA-1: ce65fdbb790a262a24aced0d9690225e3152b168 SHA-256: 5a3582e828b29d5bdd21c5dbadbe7c056cd86288391501b24686acc0c8457008
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary URL points to an HTML page, which likely serves as a gateway to numerous other PDF files hosted across various domains. This pattern suggests an attempt to manipulate search engine results or distribute malicious content through a link farm. No scripts were extracted, but the nature of the embedded links implies a potential for further malicious activity.

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://cecilyeiferle.com/uploads/1/3/0/7/130775107/130775107.html#ventajas+y+desventajas+del+sistema+por+ordenes+de+produccion
    • http://woodbridgelimo.org/uploads/1/3/0/3/130323187/bowor.pdf
    • http://clutterandcharm.com/uploads/1/3/0/6/130603946/16b1297761f39.pdf
    • http://zionlutheranpreschoolsi.com/uploads/1/3/0/3/130323566/bamematozugejit-jebuzekare-ronevix-repilegipene.pdf
    • http://www.forestbathingnj.com/uploads/1/3/0/8/130873903/dadukeropubeki_tixejib.pdf
    • http://webazoo.com/uploads/1/3/0/6/130605125/jarimexikis.pdf
    • http://mypopularfood.com/uploads/1/3/0/5/130542940/wukupewivev-bokitumaber.pdf
    • http://neugewonnenerottweilers.ca/uploads/1/3/0/4/130479123/dusukupuw.pdf
    • http://estrategiaycoach.com/uploads/1/3/0/8/130874474/nimewe_wigigizutix_gotetojujukoda.pdf
    • http://the300groupevents.com/uploads/1/3/0/7/130740221/8480085.pdf
    • http://balboacapitalgroup.com/uploads/1/3/0/6/130639647/kefag_pusimazuzaf_timos.pdf
    • http://startagreatfuture.com/uploads/1/3/0/6/130639317/kelapo-pabajixabenana.pdf
    • http://www.tennesseereid.com/uploads/1/3/0/8/130874119/soxopevulema_vufupubinawori_zonopip.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_off00006dcc.bin
438412a6852b82223aa48307d056daed2546e1c95040ddab23c7a6d4aa26e54c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCC 8168 bytes

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