Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75a8c770b049704…

MALICIOUS

PDF

36.4 KB Created: 2020-03-14 13:56:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d02dc6c7fca19c8442cf634e204ba9ac SHA-1: dc447974f03467e55f0dfc96e64616fb6c9faeef SHA-256: a75a8c770b04970490114cc432aecdddeddea90373c752ca55a94555885c0b78
94 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains references to "geometric series questions pdf" and numerous URLs, suggesting a lure to a link farm. The ML classifier strongly indicated maliciousness, supporting the interpretation that this PDF is designed to redirect users to potentially harmful content or for 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://poconohousepainting.com/uploads/1/3/0/3/130323206/130323206.html#geometric+series+questions+pdf
    • http://rejointz.com/uploads/1/3/0/2/130273610/7ff20e358951.pdf
    • http://artsandmovement.com/uploads/1/3/0/7/130775263/fobeduxagumeb-berutezexokoked.pdf
    • http://trantafilphotography.com/uploads/1/3/0/2/130270977/pekafedofuwafim.pdf
    • http://www.122corson.net/uploads/1/3/0/8/130813398/9122220.pdf
    • http://gulfbreezeperesonalinjury.com/uploads/1/3/0/7/130739850/gajaxak.pdf
    • http://needlot.net/uploads/1/3/0/2/130291033/fuwerujav.pdf
    • http://hostmaster.brockenhurstvipcars.co.uk/uploads/1/3/0/3/130323934/9ab291d9.pdf
    • http://animalmatters.com.au/uploads/1/3/0/6/130639373/4688337.pdf
    • http://sanarte.info/uploads/1/3/0/7/130775819/rurasalip_luzul_rejufupeled_duzenimunozaki.pdf
    • http://annaaufseeser.com/uploads/1/3/0/4/130483745/werekuxow_jezopanola.pdf
    • http://wellness-restored.com/uploads/1/3/0/2/130289369/52020bfe23cd1.pdf
    • http://cypherdynamics.com/uploads/1/3/0/5/130589178/2563815.pdf
    • http://restoreactive.ca/uploads/1/3/0/3/130379251/0bb71c.pdf
    • http://drperryslp.com/uploads/1/3/0/7/130738949/8577938.pdf
    • http://theluxycloset.online/uploads/1/3/0/4/130483863/tutazukiwegin_kalile_borozedanuvo_pakabivixepaf.pdf
    • http://manawell.net/uploads/1/3/0/5/130540197/mukilozoved_pisirapipuwef.pdf
    • http://fckdepression.com/uploads/1/3/0/5/130551692/rowaxabofatuxe.pdf
    • http://sagalfarah.com/uploads/1/3/0/7/130776134/wefikepilo.pdf
    • http://shadypineyardcare.com/uploads/1/3/0/2/130289377/zefodebegabogunonu.pdf
    • http://naplexpredict.com/uploads/1/3/0/4/130483847/betezesowutod_botak_towuno_wesagofukofe.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_off000067a7.bin
7231239e98e5959c4764b0dbea5e5c674ac7cfd6b76c77e8f480eab4c0425b48
pdf-font-stream PDF embedded font (sfnt) at offset 0x67A7 7192 bytes