Malicious PDF — malware analysis report

Static analysis result for SHA-256 54781274a485dfa2…

MALICIOUS

PDF

112.7 KB Created: 2021-09-19 18:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c6f679ce9ee16ee9649f0ad57b35dcfc SHA-1: fb56561e94f1e0083815c7efbf19c44105861d7c SHA-256: 54781274a485dfa2f99e03892815fee635c3e71f03a1313375dbf199a9b87074
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://synerhu.ru/uplcv?utm_term=vivo+s7+philippines PDF link annotation
    • http://pickup-ws.com/userfiles/files/64848158804.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/76691138392.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/jozone.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339001d8990---83595897221.pdfIn PDF document text
    • https://signika.pl/Upload/file/71221878984.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091614465747.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/97726797406.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/mobekekuvenapetewiliz.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/rekolezetip.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/91938347585.pdfIn PDF document text
    • https://haidangpc.com/contents/files/59221938673.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d04e2ec3ad---tavenumiko.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/kisukadufufutopozaworawij.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/74732923874.pdfIn PDF document text
    • https://tele-video.ru/upload/files/kegaxupibaritesota.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/97249430185.pdfIn PDF document text
    • https://jobtiara.com/files/files/98790577802.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/zabajironoxejin.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/dafowogekegupotokuv.pdfIn PDF document text
    • http://freetds.net/userfiles/file/rawugobowafuleki.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/badusupojuvedafe.pdfIn PDF document text
    • https://longhoang.vn/upload/files/20761655837.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/xadetanixebunubuw.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/vasopovaderi.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_off00015526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15526 10072 bytes
SHA-256: 7df66bc44cfb2a7089f79d77a09eb5a4deba4b88044f2df71cb69f0790d909b4
font_01_sfnt_off00016b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B8C 18640 bytes
SHA-256: bfa3db3102d6c4efc8b71627a1a78237bebc56a732a41597b28ca6f8f1c96ca8
font_02_sfnt_off00019ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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