Malicious PDF — malware analysis report

Static analysis result for SHA-256 27036090e4f12d4c…

MALICIOUS

PDF

68.4 KB Created: 2020-03-30 09:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d79fb162a5ad471fe9bbec72878fd4e8 SHA-1: 5a6ed979195ff4687e91a2e3668f82a60e35000d SHA-256: 27036090e4f12d4c7780e88b14f5ab3139b8980c24158f88b75296adf67e85e1
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or SEO spam campaign. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific intent beyond link distribution.

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://sweetestdreams.org/uploads/1/3/0/5/130590395/130590395.html#martha+martha+zadie+smith
    • http://looe-festival-of-the-sea.com/uploads/1/3/0/8/130813357/sizelabixone-fupujopu.pdf
    • http://styleboundarts.com/uploads/1/3/0/3/130379061/ebbbc.pdf
    • http://bearlakebearsfootball.com/uploads/1/3/0/5/130545573/36760ecd84f16.pdf
    • http://mind2talk.com/uploads/1/3/0/7/130740561/vadukitos.pdf
    • http://kcheavyequipmentrepair.com/uploads/1/3/0/6/130604543/nejiwizemanamanejufo.pdf
    • http://thebruceagency.com/uploads/1/3/0/2/130289254/petilorosimis-kizegabolasaran-nukeludiwuxo-pakosepoliwu.pdf
    • http://banginhardfireworks.com/uploads/1/3/1/3/131398424/xamimakaxanimunamu.pdf
    • http://raptor-dynamics.com/uploads/1/3/0/2/130287914/novugevunokobe.pdf
    • http://marianhuberart.com/uploads/1/3/0/4/130483337/1973525.pdf
    • http://jwsteinman.com/uploads/1/3/0/5/130588343/7969043.pdf
    • http://tinytreasureschildcarecentersc.com/uploads/1/3/1/3/131383982/28f83061.pdf
    • http://0negocios.biz/uploads/1/3/0/3/130313192/sifijasujikumidiziv.pdf
    • http://brentonblack.com/uploads/1/3/1/3/131382886/f231342f38b.pdf
    • http://koldyssportsbarandgrill.com/uploads/1/3/0/6/130604213/dedosawigew.pdf
    • http://lincolnmattressfurniture.com/uploads/1/3/0/7/130739022/6274454.pdf
    • http://foolmyfriends.com/uploads/1/3/0/2/130272240/fejejiketa_fimopi_vivotuval_luxade.pdf
    • http://mykinkclubcams.com/uploads/1/3/0/6/130621805/badov_filore_jajisegupotoluv.pdf
    • http://thetherapistmomcircle.com/uploads/1/3/0/5/130538836/5167775.pdf
    • http://hadassahsmantle.com/uploads/1/3/0/9/130969648/gorozogukadukowujoko.pdf
    • http://www.enjoyyychristmas.com/uploads/1/3/0/6/130604519/3546925.pdf
    • http://greenmountainmangalitsa.com/uploads/1/3/0/5/130539102/jajadizebifixati.pdf
    • http://evindalepins.com/uploads/1/3/1/4/131438461/9124343.pdf
    • http://rigales.com/uploads/1/3/0/8/130873976/e8d17b9c50cf04c.pdf
    • http://poshgroom.com/uploads/1/3/0/7/130775263/237916.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_off0000e2ad.bin
3d7fc1570c40272ddda1583d7576f58ed1743a85a1e7f2b065b277bd6d44deb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AD 8232 bytes

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