Malicious PDF — malware analysis report

Static analysis result for SHA-256 951d3abfa7da7745…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 12:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3cad0b7b23810fb4f2b60260540345c3 SHA-1: 01f6e987b16dd624ee6f2be847275a0a68d2d3c3 SHA-256: 951d3abfa7da77457d4592d3778187c060c0c648c83bced61f65eea792125a0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which host PDF files. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chambredhotes-savoie.com/ckfinder/userfiles/files/69848373427.pdf In PDF document text
    • http://giaexploring.it/userfiles/files/42332836685.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/jegovonigilerulap.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/93533977388.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0337717001631297478.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • https://pastelbuilders.com/userfiles/file/wapegunuraganibadepet.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/foxovosizilivefikefiven.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc70a60699---jipetemajeguze.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/namuvaju.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210914_114617.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/wunukinuxegegopijaro.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/bufunenadakedabiw.pdfIn PDF document text
    • http://m2m2design.com/userfiles/35264245037.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/xodazemu.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/safasu.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/8334856775.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/68680264087.pdfIn PDF document text
    • http://ymmicro.com/files/files/29139451783.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/88736612037.pdfIn PDF document text
    • http://drironcat.com/images/file/18455425421.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/83419960371.pdfIn PDF document text
    • http://haki.vn/uploads/files/72213368692.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///vawoguwofetesubob.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/xuvumarevoxago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+mail+app+not+syncingPDF 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_off0000b2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D8 15604 bytes
SHA-256: b9fc9c314ed9e0844c71a770c5e5860584f401c26b6126120f4d6cbfa85bf0c0
font_01_sfnt_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 10820 bytes
SHA-256: 12fd036f2d1a0f2ddb66af0513d0fe9125a40d4f9e19401f6f242ec9a7aca3f0

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