Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f23b631b3887918…

MALICIOUS

PDF

78.2 KB Created: 2021-09-10 06:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2f3e66775227593ca04e961369b4ec9 SHA-1: c71a513d003b2325bfbcea7ed38dd56bccc5ee7e SHA-256: 9f23b631b3887918a7e9afd9827e755d518ef4336ed31251734458cd57fe4e89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to PDF files hosted on potentially disposable domains, consistent with a link farm used to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is the intended attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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://ajur.rest/uploads/userfiles/file/guroleworizon.pdf In PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/65307689831.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/biwutakujikijebawatovubom.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1631000256/file/52275577839.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/11c374d305a50fea2f790e708346fdc3/47464924175.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/45520127871.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7909c2769---nizapemopovadoli.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/teden.pdfIn PDF document text
    • http://elitacasa.it/images/file/83698635247.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/20407347921.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/pumuzikuruf.pdfIn PDF document text
    • https://allianztc.ro/files/file/17457617864.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/42470480968.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/delolizig.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/kelekamifewozirujiva.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/82570042265.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/74299251547.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/29232881689.pdfIn PDF document text
    • http://360global.ca/userfiles/file/62149298330.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/lupagadel.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/62960158773.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/disipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=zombie+objective+hack+apkPDF 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_off0000c770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 10612 bytes
SHA-256: f724e574396e4791ecebdd0b878bc54cc53b07bac5bb515c1731f42eeadc9d3d
font_02_sfnt_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 20592 bytes
SHA-256: 74b48af0b38871b35b24b5b044cb78776ebfdd94346c565aa79ce35e849195f2

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