Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c0f9ec42ccc8d3…

MALICIOUS

PDF

106.3 KB Created: 2021-05-01 14:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c770f09b51aea245feb506feafc6f178 SHA-1: c05aedd9de7f9b3579debd9212cf38abcf73a939 SHA-256: 23c0f9ec42ccc8d3072f65c37556a9ff0c3508b5b45dbb2903481dce5eefc227
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users. One prominent link, 'https://fokemale.ru/strik?utm_term=brother+intellifax+4100e+user+manual', is identified as a redirector, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=brother+intellifax+4100e+user+manual PDF link annotation
    • http://felesatediz.medianewsonline.com/desusu.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/74286134996.pdfIn PDF document text
    • http://gopusoduj.mygamesonline.org/80336685507.pdfIn PDF document text
    • http://xupevagadozojad.22web.org/95831263633.pdfIn PDF document text
    • http://dosefokinuvulo.mypressonline.com/nafopipigutewulu.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/jezobasit/messenger_mod_apk_for_android.pdfIn PDF document text
    • http://tirevotijo.epizy.com/3_axis_cnc_machine.pdfIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_8f22a8b67d2941a2985310aada817b0d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/67345311491.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/best_place_to_buy_bob_stroller.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/kohler_cv15s_motor_for_sale.pdfIn PDF document text
    • http://mobisojew.epizy.com/khan_academy_sat_practice_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/zilagenakudi.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/buku_politik_etis.pdfIn PDF document text
    • http://totuxivez.onlinewebshop.net/currency_trading_basics.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/80805324595.pdfIn PDF document text
    • https://a181bb3e-7445-4f1f-a1cf-b2fe66c13e92.filesusr.com/ugd/91ce54_bde598794ac44a40959e794597f3714a.pdf?index=trueIn PDF document text
    • http://giwibuwasiwa.rf.gd/mutagorewapazagofik.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/yardi_voyager_work_order_reports.pdfIn PDF document text
    • https://e1dd9d5d-2564-403b-b9eb-750b563e155e.filesusr.com/ugd/00b056_b5c194b54a2841f3ac00487b0fd36fb0.pdf?index=trueIn PDF document text
    • https://761e60ea-5e0e-4c43-b4c2-f6a9045c608d.filesusr.com/ugd/545033_2d4cd55cdd074697b0dcb815fb25d43e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/44300339624.pdfIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_b12aa3ab94c643088b4b38c69a56b0ad.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16009 5404 bytes
SHA-256: 75ebae73a25bca7a66cedb513460e07854115cec5367343637adf42a1e43f0e9
font_01_sfnt_off00017251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17251 12564 bytes
SHA-256: 072c5cfee1cebace1d2dfe88382be7200bd30e8f169cd63027089c02b2382404

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