Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c0e629a5b25adc…

MALICIOUS

PDF

49.8 KB Created: 2020-03-23 16:17:43 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fc2551016ff1edaa33b1f98158957e53 SHA-1: 840c0ad53835d3d308a7a07d0dbb62d780787c2f SHA-256: e6c0e629a5b25adc7848b2dd519261b228ab44b1afa145736df9b7cfef2a5af3
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, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document body itself is largely unreadable but contains references to URLs, reinforcing the link-based attack pattern.

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://harrisonrappaport.com/uploads/1/3/0/5/130590738/130590738.html#convertir+numero+a+notacion+cientifica+online
    • http://www.triratnaleicester.org/uploads/1/3/0/7/130776075/datejekepeselaxuz.pdf
    • http://swboffice.com/uploads/1/3/0/4/130436482/modem.pdf
    • http://dodgeplanroomqa.com/uploads/1/3/0/7/130739879/3ad20.pdf
    • http://kohai.moe/uploads/1/3/0/8/130813546/1120040.pdf
    • http://darkmountainsoaps.com/uploads/1/3/0/6/130620778/1fb6602aa.pdf
    • http://mail.robinff.com/uploads/1/3/0/6/130604034/jabip.pdf
    • http://nadlanonline.net/uploads/1/3/0/3/130323126/vukosulil-wusofalosope-piwelumogimake-galavitogoda.pdf
    • http://www.kelianpersonalized.com/uploads/1/3/0/3/130313428/52182.pdf
    • http://knowticer.net/uploads/1/3/0/2/130288310/223044.pdf
    • http://mattborn.net/uploads/1/3/0/2/130270742/a9cb5de7b.pdf
    • http://makeitwordpress.com/uploads/1/3/0/5/130590312/xemebe_zodigubibo.pdf
    • http://finnishspitzinternational.com/uploads/1/3/0/5/130545698/xisifivajerobewu.pdf
    • http://www.gradivusdesigns.com/uploads/1/3/1/1/131164023/kumajorutunomufi.pdf
    • http://christianfellowshipgoldriver.com/uploads/1/3/0/2/130273850/651836e.pdf
    • http://brownallyear.kiwi/uploads/1/3/0/5/130588698/2465417.pdf
    • http://ppconsulting.net/uploads/1/3/0/3/130313324/ronedefo-bujawidut-dimefesagilufi.pdf
    • http://iciarsandiego.com/uploads/1/3/0/5/130551267/xedopov-kexosisitulopu-rawunifases-dumafepevix.pdf
    • http://customerexperienceworld.co.uk/uploads/1/3/0/2/130272385/2281742.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_off00007ffe.bin
01e65aeb6dded144fc6459240ed734cd6eb2317208ed5f10792925899547b3d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFE 9648 bytes
font_01_sfnt_off0000a2d5.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0xA2D5 16036 bytes