Malicious PDF — malware analysis report

Static analysis result for SHA-256 409bf71748ab31a2…

MALICIOUS

PDF

68.1 KB Created: 2021-09-13 19:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1df871ef999560c41e5c0a70e03031ac SHA-1: 7dac1761c5c1994dbfc1ba7070c478fe58c89b20 SHA-256: 409bf71748ab31a293216af0cab683b44c18e8cdfe9228dd7ebed1ca6f38eda5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to external domains, with many identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://myparrotfood.com/user_files/files/80337314716.pdf In PDF document text
    • http://ourconn.com/userfiles/file/202109111130573160.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/77448246954.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/60576278815.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/lonopidupevozejutiwum.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/xulevixokatebofojexifaj.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/23345886592.pdfIn PDF document text
    • http://z500.si/files/vekofutape.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/weletidukog.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/noxobej.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-3/20210903034930498231.pdfIn PDF document text
    • http://emeat.ru/var/files/rawopugarisovunaruzovagof.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/13183232525.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/zakukaxamesi.pdfIn PDF document text
    • http://www.520amis.com/upload/files/givibuzizugisopexa.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109061750469904.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/44005807275.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/87355516004.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134d00cf0601---fafizusetiv.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/mofebotapujapekuxa.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/wopub.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/49865338548.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/66383854760.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/fagoponuvokesotev.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/12125919875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=live+nettv+app+downloadPDF link annotation
    • 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_off0000b00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC824 10228 bytes
SHA-256: 83035126995ebc7c21454539bb00890347cc9f33593dbd069a6c802155206d4d
font_02_sfnt_off0000df33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 14320 bytes
SHA-256: 912fdadc84e2bcdf4d1d68cd756a92a80f21386b34aa840a0d8ce02c9abeda25

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