Malicious PDF — malware analysis report

Static analysis result for SHA-256 16684911460afdf1…

MALICIOUS

PDF

71.5 KB Created: 2021-09-16 02:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8819a6ab0ca9128b73ece9adb58c788f SHA-1: 5a1b03fff4bc8e23ce08a4a319b5a959d2095bb2 SHA-256: 16684911460afdf1df6844b14b7260b4575b92e3f4caa9bfdad604274f98d0d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics indicate the PDF acts as a link farm, with numerous external URIs pointing to disposable hosting, including a suspicious URL containing 'utm_term'. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URIs suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 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://pixomot.ru/uplcv?utm_term=harvest+moon+friends+of+mineral+town+codebreaker+codes PDF link annotation
    • http://miwon.com.vn/app/webroot/uploads/files/12343179954.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/dezememukujubir.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/vusunobenulasabipiw.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/97404574009.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/sosuxaxip.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/viwozegomojusukarose.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/punofozovelorabakeriwedek.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/mubuxosu.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/97317962794.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/lopilezatojike.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/5071895808.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/73624713498.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138df28437ee---nogutid.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/34771631925.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/nunubelanukarolaxobi.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/gkr7kut50hsirasvbv4sttas8o/344701263.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/dibobige.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/64864909287.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/86440629212.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/52507630196.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/47284866701.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/91029904367.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/tekorivalifopojuwi.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://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_off0000b606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB606 15624 bytes
SHA-256: dc1a936c83db8906da90a4e11cbf57aee059c2b487d0ba34497f2e4f79c84a0b
font_01_sfnt_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 11012 bytes
SHA-256: 71ccce696b28ff6da67e97aeb908a2b62728edc84f48ddb4cae369d286e2f6c2
font_02_sfnt_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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