Malicious PDF — malware analysis report

Static analysis result for SHA-256 b532b48db0ab0c24…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 20:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6c9eb26ad85f8123bc73e980d7bca9da SHA-1: b7e53c7d16e7ad2090ffe65eeecff9811339252e SHA-256: b532b48db0ab0c24deec7d1a15a3fc58f3e233c7ef7bcbced3a3c56053b0b977
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics 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 links are consistent with techniques used to redirect users to malicious sites.

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://angkalaris.com/contents/files/89032905505.pdf In PDF document text
    • http://lmleadmanagement.com/userfiles/files/66695226761.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/nunikiwuxezuwegadu.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/43111506948.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/nojosijonesodenafusov.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/tebiwolujopapeg.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/tobomubelufex.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/sopajomefijimoje.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2da66f04e---vabajevaruxijetadubib.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/72097518555.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/jujavuguzev.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/45372567364.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/9455032208.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/86826453535.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/muwowadotirawoz.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/madefajonotepevaxuro.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/1623942568.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/80928871974.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/28444298700.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/62973389530.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/sagatovodesurakedaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+walking+dead+season+10+episode+21+streamPDF 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_off0000d63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63B 18508 bytes
SHA-256: 2f0cc2f6864b8be306af31a0d73591ad2ad6aead33e9fc87207907ce8f346f4b
font_01_sfnt_off00010618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 11276 bytes
SHA-256: d09409528778febfa3350bf38e0867742f1283a3add4411545dd40e62a491b90

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