Malicious PDF — malware analysis report

Static analysis result for SHA-256 d405f0cb49f2ce20…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 04:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ddc9173d5e10d2afe2aff9fcc6bb2ca SHA-1: 62d0a71258bb8e576d6a725c76b36ebd493ae89b SHA-256: d405f0cb49f2ce206537dea3c235a3236831859508cd64a0fbc52d04b24a28df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of these links and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/b2ng9n0dde6krnu1v6npd3d6n5/3578463851.pdf In PDF document text
    • http://mamolenasnc.it/userfiles/files/50529054843.pdfIn PDF document text
    • https://membermimpi.com/contents/files/52433491003.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/zokafinazawamo.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/68988777269.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/kitinuzemorizigadiruka.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/24195731370.pdfIn PDF document text
    • http://bjjiffy.com/upload/numokuwedisuvax.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/fefiwatax.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/dimegazinisowikurimo.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/jojosurelidesegu.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/95076171945.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210927075128.pdfIn PDF document text
    • http://4rrecycle.com/files/file/89070686076.pdfIn PDF document text
    • http://gapp.fr/medias/files/repademokavinoxexer.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/wowegil.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/94784725918.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/bofubibepivisivepozifop.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/jupuwovujeregogimatuxaku.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/1393604948.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/nufugolob.pdfIn PDF document text
    • https://sportscientistsviews.ijmsir.com/ckfinder/userfiles/files/sumalidozek.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/mokofataxitufuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ipad+app+store+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_off0000b322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB34 17188 bytes
SHA-256: b7dc586b46394d118cec6c7c8172cc4a1e8c83ae7d535bc5cdd27ee184f7b99e
font_02_sfnt_off0000f742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 10332 bytes
SHA-256: 598ffa6b8655973156c4e098997778d4363efebdbf984447d82733dc0f3d1b49

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