Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e3cd65570e6e6d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 20:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 121017f35baefb7f4c4c17c39e517920 SHA-1: 0f1594441bbe5d761449e41fa21d9a9cd70f4c90 SHA-256: a2e3cd65570e6e6d4f3570aebfb1bdae35af0e18a627999b9df37312c9fc22ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting it functions as a link farm or a downloader for further malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces this assessment, indicating a pattern of distributing malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://travellightnepal.com/userfiles/file/50290912119.pdf In PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/95050563720.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/fozumitekiwogebelesosibab.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/83959416814.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210918_005333.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161408cbceaef6---kabozejevot.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/13058010164.pdfIn PDF document text
    • http://rrarental.org/upload/file/zerugirajox.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/71880255212.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/morimodipi.pdfIn PDF document text
    • http://getem.pl/files/file/26103558269.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70276782169.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/37317349475.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/pudotutawebuluxus.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/dirajikivesevukinawit.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/zevurotumajig.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/48481996459.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/2557994090.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613034ff10b9d---63651478668.pdfIn PDF document text
    • http://gaudi.tw/upload/file/pajarefizapemerozaz.pdfIn PDF document text
    • https://gilbertems.com/videos/file/rigemalaludezevelutalurog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tiny+planet+fx+pro+apkPDF 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_off0000d5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDD 20368 bytes
SHA-256: c467ba46090dd1ea462ade086b96b91db796db9e2cacdf3c21a6c0167eabc997
font_02_sfnt_off0001236f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236F 10456 bytes
SHA-256: 70c1b8a5d342700b52c684f2e2fcd176af0ec59106261b56a42f53c71b3d71c7

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