Malicious PDF — malware analysis report

Static analysis result for SHA-256 5109109efb1e1428…

MALICIOUS

PDF

79.1 KB Created: 2021-03-12 17:49:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c9bc7e850065b569974d0464484fbc44 SHA-1: c4589dc7369e09b898d3530c4108582271257eca SHA-256: 5109109efb1e14286587f1f3d8e6d5008d885b913561c22b28649c8fd95834a8
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a high ML score. The file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://crophysi.ru/strik, which is likely used to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=data+warehousing+for+beginners+concepts+%2526+issues+by+a.+abdullah+pdf In PDF document text
    • https://mabatuba.weebly.com/uploads/1/3/5/3/135303696/kexunumiseberefaw.pdfIn PDF document text
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/vaxib-vixasereralegu-ligiwiv-bikisesajodeden.pdfIn PDF document text
    • https://vemesefopega.weebly.com/uploads/1/3/4/6/134684253/pavimetinatojifotu.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/saduridibawajofo.pdfIn PDF document text
    • http://rofuxipof.mywebcommunity.org/saxifulefudiwixadeperuv.pdfIn PDF document text
    • https://duzozutilitu.weebly.com/uploads/1/3/0/9/130968921/vajanonimag_nitudonumimeluk_xizenutadifar_fupuguwuj.pdfIn PDF document text
    • http://sewatumafuta.medianewsonline.com/73387641485.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/holmes_heater_fan_not_working.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_6c0613b4906347c39bb8a2381c53ac6b.pdf?index=trueIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_333462dbbed9422c95c07af3e6dc233e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fexuror/45532160056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25cfde65-115f-4333-981e-cce894887c6f/23855642409.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/payzapp_old_version_apk.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_d1bd10ea9cca45b793beaecd5091c123.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd2ad6d1-b1ef-4687-8d6f-2ffe126da792/gotevatimirarigiverel.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_6bbd10abcb434df39565c3822ed18983.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/76428961917.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/42947316883.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/airtame_setup_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/furupifojokifux.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/vajokiditewafux.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_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 5476 bytes
SHA-256: 42efbb4a9135300ab52846828f517ffabe27aebd7af22f7cee6c51b5c6601d5a
font_01_sfnt_off00010ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 10460 bytes
SHA-256: 8145a2d96f5b38998ecc8de03d3a6018888e8c70d1926cb591d99e9f07b815d4

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