Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd25b0ed668fdf0d…

MALICIOUS

PDF

77.1 KB Created: 2021-03-25 06:01:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 301118c8e28e22c30690e32faf872ce1 SHA-1: 505dc0d265456898379a9b07654021c0c2d9aa41 SHA-256: cd25b0ed668fdf0d28fc85ce63ebda9440a23ea1e5b2340108e8baabafcf4775
226 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to various external PDFs, one of which is advertised as a 'wifi password breaker apk'. This suggests a phishing or social engineering attempt to trick users into downloading potentially malicious software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/wix?keyword=wifi+password+breaker+apk PDF link annotation
    • https://cdn.sqhk.co/tuzevawu/e1Gyi1A/31672928411.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/igeQgif/tractor_cannon_exotic_shotgun.pdfIn PDF document text
    • http://keepxufi.space/kanubimevidasi6n6vp.pdfIn PDF document text
    • http://zifufarox.getenjoyment.net/levawowimeteja.pdfIn PDF document text
    • https://cdn.sqhk.co/memenewo/b8cjfib/dijorifez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484126/normal_6044da0bac9ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_605330b996eba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370288/normal_5fcb7b0b937a4.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/system_analysis_and_design_mca_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/zotiperugi/ghj5hja/blaze_of_battle_facebook.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/kjdtjfN/nouveau_schema_electrique_application_frigorifique.pdfIn PDF document text
    • http://itasda.online/ejercicios_de_gramtica_espaola_para_italofnos._niveles_a1-c21aa3l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/xefitujebizim.pdfIn PDF document text
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_7f19182da01848888c40e93b1490b107.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolawatin/13121587574.pdfIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_f1b7a585040e4b1199565fba89cf2c83.pdf?index=trueIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_ba5befbc74314263b498185beda5335b.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_47597372353a4120ad620628ca49da13.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 5312 bytes
SHA-256: bcb8cfc57b257e421cbef14c382926364fef1976509c0ca58f5b3bf9c5010170
font_01_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 12440 bytes
SHA-256: 8ac8a70e1dcde6ed53aa2c893a1720f9594fba9fbb5f2cb7e6f844284da5e8e6
font_02_sfnt_off00011287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11287 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073