Malicious PDF — malware analysis report

Static analysis result for SHA-256 48313cdd505f55d8…

MALICIOUS

PDF

71.8 KB Created: 2021-09-29 01:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 946c29045cf3394e7aae1ede98132c70 SHA-1: fa91c4df4172a07ab79ee8224e67a681965d9ed8 SHA-256: 48313cdd505f55d8eb3b4ed0be37e8766d78f9b6eab9ac8879393c5c2de1c8ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on disposable hosting. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious external sites. The presence of numerous unknown URLs further supports this, indicating a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ppkh.net/userfiles/file/30727108131.pdf In PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/23046285578.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/nibokaxelidilujofuram.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/67299106507.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/89882854806.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210920204745.pdfIn PDF document text
    • http://seamacros.com/upload/file/24977668344.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/lajenatu.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/30266927447.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/potatagokavigupemikape.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/27869632759.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/wafegemedusatek.pdfIn PDF document text
    • https://ivanamihic.com/files/mapixedufirejixewomibu.pdfIn PDF document text
    • https://sergiomauri.com/images/file/ruvamisefeto.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/36262505724.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/52393312400.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/relomapakopebamuta.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/lolixikevilinojuwi.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/ropukinujut.pdfIn PDF document text
    • http://mqskin.com/luutru/files/jesozarawopilupuboxejag.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/93611913686.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/zavuribujeludujanarotiw.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/74670154505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=top+android+pc+emulatorPDF 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_off0000b4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A5 10572 bytes
SHA-256: 606345b4b39e8a5c24d690efb939a413b9f2e1905ade7799b8429c1549313eb3
font_01_sfnt_off0000ccb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 17432 bytes
SHA-256: 471c569a7ecf7973b054e2f8b188571b841393747de9e885246be1428c7d8ca3

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