Malicious PDF — malware analysis report

Static analysis result for SHA-256 c866ba5cbba0b745…

MALICIOUS

PDF

64.7 KB Created: 2021-02-16 06:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f87b4f5b4a86fc01ba09b3c97a717060 SHA-1: 2b5c294e38304d909877d21972650a7f3b2c1888 SHA-256: c866ba5cbba0b7454fb56fae1ad1472c7e3dc8af85ffa984cd7b2217586047a4
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, characteristic of a link farm or SEO spam campaign, designed to drive traffic to potentially malicious sites. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests an attempt to redirect users to external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://leonvi.ru/strik?utm_term=john+deere+mower+seat+sensor PDF link annotation
    • https://cdn.sqhk.co/bibilofefi/hgPhcv6/punadudomamalo.pdfIn PDF document text
    • https://difototasewi.weebly.com/uploads/1/3/5/9/135986065/tuxafidub_taropijesopegu_sopapokeriveruk_mujinanu.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/heiGij4/lufumebivezamolopef.pdfIn PDF document text
    • https://cdn.sqhk.co/pimupigedu/hdaJtWa/gesevaponilo.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/jaegjgJ/99923680086.pdfIn PDF document text
    • https://cdn.sqhk.co/mozoposowi/WyhiAjj/my_talking_hank_game_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pasezateda/eCEigCJ/detention_pond_maintenance_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5fd34cfe3aaae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kodibonu.rf.gd/enga_karuppasamy_god_songs_free.pdfIn PDF document text
    • http://gexegufikide.epizy.com/a4988_driver_datasheet.pdfIn PDF document text
    • http://vowukexakajan.rf.gd/donowileramisarorugepopix.pdfIn PDF document text
    • http://womopemi.epizy.com/tibuvalu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB5 5112 bytes
SHA-256: c6b4d66ce9727aa74b34d01dffa90846fa966825cb54e88cd2b1cc63469b9c08
font_01_sfnt_off0000d0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F3 10848 bytes
SHA-256: 55cd8697f82175b5311d7cc1dcf6d9677383f29f4b8ae439b9a303d4d0544012

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