Malicious PDF — malware analysis report

Static analysis result for SHA-256 6317b1834c968ec5…

MALICIOUS

PDF

72.1 KB Created: 2021-03-02 01:23:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 39e38668b98c9ef449a062f249eab2e6 SHA-1: 9b126ded8435ceb4987dc6dcdfc4a7c3b3b682d0 SHA-256: 6317b1834c968ec546f296cc21a4c4a4ab13284e79eb6157e5e8838b9e2e77ee
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though corrupted, suggests a lure related to educational materials to entice users to click on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://xajibur.ru/strik?utm_term=area+and+perimeter+word+problems+worksheets+for+grade+6+pdf PDF link annotation
    • http://sdorovie-sustavi.xyz/maximum_ride_movie_free_downloadj4dro.pdfIn PDF document text
    • http://blankid.ru/bootstrap_template_for_asp._net_websitesbokk.pdfIn PDF document text
    • http://pay-order.info/list_of_landlocked_countriesbm4nr.pdfIn PDF document text
    • http://mon-cmb.best/sepejuxewnad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465259/normal_601248da5f926.pdfIn PDF document text
    • https://dukuvelawabuze.weebly.com/uploads/1/3/0/9/130969723/3542859.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445866/normal_5fcce50d924b4.pdfIn PDF document text
    • https://daxigowopijadek.weebly.com/uploads/1/3/0/8/130814785/pejidina.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/guvovigo/4299111291.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/34244327378.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/oswald_demi_bold_font.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/traitement_bronchite_asthmatiforme.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/automate_programmable_siemens_s7_300.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/jetoxixebatebom.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/36196906564.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_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 5896 bytes
SHA-256: 8fb4bba4f18e7c889a0aa6039e59c67ead9ea24c5e26247300a6fbc6a9ccd5b0
font_01_sfnt_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 11000 bytes
SHA-256: 7071674c3d66203f3795fedb1f3018e2052e32ad8728d9087604dc7b2aa64c35

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