Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6c499890cbd827…

MALICIOUS

PDF

65.4 KB Created: 2020-03-27 06:10:46 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1d0a8bfe58639aaf5dd0b3307ea5cad8 SHA-1: 143b32156f542d6db366080d82f9f185b32c202b SHA-256: 3d6c499890cbd82765db9d9062c81466def8fed835a8ae3bf65c7af3251c63a0
94 Risk Score

Malware Insights

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

The PDF document contains a deceptive title related to educational software and embeds a large number of external links. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or a distribution point for further malicious content. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves directing users to potentially harmful external websites through these embedded links.

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://everestdobie.com/uploads/1/3/1/3/131398231/131398231.html#kuta+software+infinite+precalculus+dividing+polynomials+show+work
    • http://www.cursosnutricion.org/uploads/1/3/0/5/130538956/fimasibi.pdf
    • http://serverkoc.com/uploads/1/3/0/7/130776885/zagimuk.pdf
    • http://pastorgregj.com/uploads/1/3/0/8/130874674/pirari_senamop.pdf
    • http://delorenzohaircare.com/uploads/1/3/0/3/130379625/rezebufod-gifetigate-satumunozaw-jerilubibider.pdf
    • http://freekyeah.com/uploads/1/3/1/0/131070010/6234701.pdf
    • http://eunoiaherbals.com/uploads/1/3/0/7/130776319/3a06ca993be1.pdf
    • http://casadelloco.com/uploads/1/3/0/4/130477533/jodujafidutotus.pdf
    • http://jammpublishing.net/uploads/1/3/0/3/130323196/sexuvojowolanupimak.pdf
    • http://www.dreamvillasguatemala.com/uploads/1/3/0/6/130605270/kaletonigogin.pdf
    • http://bloomandbeyond.com/uploads/1/3/0/7/130739037/warituzexi-tamoduludelami-bujumakojuzi-wojupiwexinixan.pdf
    • http://moyo-up.de/uploads/1/3/0/7/130740502/69dcd50.pdf
    • http://kyroots.org/uploads/1/3/0/6/130605104/1629538.pdf
    • http://thearchitecturalgardendigest.com/uploads/1/3/0/5/130543093/nabapo-bagedojogujariv.pdf
    • http://www.montessorimentor.org/uploads/1/3/0/6/130605358/7055cc6d35.pdf
    • http://slimjeggins-sale.store/uploads/1/3/1/1/131163943/giravalal_sitafominas.pdf
    • http://www.funtasticrental.ca/uploads/1/3/0/7/130776366/tedetuwufaviw_rubudarakez_zoxekutajo_zovujewesexu.pdf
    • http://lakeplacidvision.com/uploads/1/3/0/2/130270946/4860326.pdf
    • http://www.eclectricity.net/uploads/1/3/0/6/130605001/bujanipupewoloxufo.pdf
    • http://stonewallpools.com/uploads/1/3/0/6/130621607/704224.pdf
    • http://paws2paws.org/uploads/1/3/0/9/130969727/4008794.pdf
    • http://hongkongkahns.com/uploads/1/3/0/7/130775594/eaac9.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_off0000c5b1.bin
129ce7e6bc777723122bbdb5462403133182bf51c92d13420c00e40ebb79650f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B1 9208 bytes
font_01_sfnt_off0000e855.bin
e4cf7ed9ba452be5a7b82254715bab0d1b90dbada83883215a56696eec6715dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 4436 bytes

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