Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ab3e8196de09e4…

MALICIOUS

PDF

75.9 KB Created: 2021-09-17 08:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 93c26599ecf4055bd12e6ad5c9b731bf SHA-1: 4883348dba64f5e52546b6cc415c58ec35f6bd57 SHA-256: 61ab3e8196de09e47187ee525b3d464a25482a7fd8ae8d4e2b1aadeee48ce35b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pixomot.ru/uplcv?utm_term=justice+a+reader+sandel+pdf PDF link annotation
    • http://gianniarnaudo.com/userfiles/files/zidumazawezetolosupegiko.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/voroxovaj.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/gozilasaxomafakiseb.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109040500504717.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/15286919691.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/poxugagarupanijusaribeto.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/wugomatibumito.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137c49b22eec---901934324.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/bezozazunipozidem.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/gilofirokurobokibofis.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/70425569921.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/44620354075.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/kawotudixu.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/48577581168.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/sowara.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210905_101757.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136b923abf2f---40219048311.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210908153508.pdfIn PDF document text
    • http://savemaxint.com/files/file/83290534945.pdfIn PDF document text
    • http://hanleyresources.com/images/59140127764.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/xutidaka.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/lamodanimovisokujejuna.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_off0000bf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF17 10584 bytes
SHA-256: 77cb4f12412b00c36e019efccb042f1cbe799b70a22ea2cb9d300a1fdf85a6ca
font_01_sfnt_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 19340 bytes
SHA-256: 6f6b1f6b759c2172bf1ec1393ae87fe3c737c9c09837109868d657157928e52e
font_02_sfnt_off00010a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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