Malicious PDF — malware analysis report

Static analysis result for SHA-256 32d511e150e722dc…

MALICIOUS

PDF

89.6 KB Created: 2021-09-10 17:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 9152d031b05e2e7f5af7bacc5f28cf7a SHA-1: 0acad0c58afa39d0485c2e957a2c096a4ba022e7 SHA-256: 32d511e150e722dce654d5e9635250c81132f7e39e21abe1a2be33cf9a73f45a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of a link farm on disposable hosting, combined with a visual download button lure, suggests an attempt to trick users into downloading a secondary payload. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42920224783.pdf In PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/turelomufokisisikal.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/vizenogemigekosime.pdfIn PDF document text
    • https://serka.com/serka/upload/files/86061799334.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/19258681408.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/98327020751.pdfIn PDF document text
    • http://gapp.fr/medias/files/tipininodukasidaduzuleg.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/59685494471.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/jumanelevuko.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/13289272157.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/wodebakewa.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/kilusalarijadesi.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/34958901871.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/91505521309.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/10817758505.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/lokogoroxubowupufuwogu.pdfIn PDF document text
    • http://samtle.net/ckupload/files/dijizovuredezajakut.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210903222741748.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/56478723463.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/54450175540.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630732100.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/89459129275.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/mubim.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/zatanutajef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=campbell+biology+10th+edition+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_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 11116 bytes
SHA-256: af5ac591b91016f000943eb53a57ab6337d544f50c1a0c50c9a412f61578e5e3
font_02_sfnt_off000123ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EF 20180 bytes
SHA-256: c57380a03c6a1abc563448d5c9ab36adbb070dbb65da6c5a4b520cad355ab291

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