Malicious PDF — malware analysis report

Static analysis result for SHA-256 5086b112589e6178…

MALICIOUS

PDF

77.6 KB Created: 2021-09-12 05:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05329e8412df83fbf349c084b12b61e1 SHA-1: 3848f7b487c3cfe24e9b0ca5b80d33e5f1c9daf9 SHA-256: 5086b112589e61788f1cdccff80a2d1babdda03aee9f25008b7f5c5fe100779c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to obscure the ultimate destination and evade detection. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://ww150004.linebot.net/upfile/files/20210902175546.pdf In PDF document text
    • http://gdlianyu.com/uploadfiles/file/kurasitatabexufiref.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/nudonivev.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/sakasuzotes.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/91551478123.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/39615696916.pdfIn PDF document text
    • https://sambelteri.com/contents/files/laduleteme.pdfIn PDF document text
    • http://hocomesun.com/upload/vaxibepog.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210902050554.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109042136077373.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/limogoxigajamuzil.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5e02c0634---8220368547.pdfIn PDF document text
    • http://air-con.ru/upload/files/pavakunapovelen.pdfIn PDF document text
    • http://happy-land.hu/editor_up/rofijezo.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/ligisolunosojagudi.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/zuxeterujumo.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/pufakerovepotel.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/9495608512.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/19369636693.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/kinakesasupijewomukejuto.pdfIn PDF document text
    • https://verner.lt/images/files/podiwaxigalubogowazokek.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/wometevi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf4bfc4ddb---53610079732.pdfIn PDF document text
    • http://charontrade.hu/data/file/78485530901.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/vuvipomepas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=power+builder+para+androidPDF 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_off0000ca63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA63 10444 bytes
SHA-256: 457b2447cfbbfe762a9a1826ac32cb295824632f44d297297ec9da8db916d03a
font_01_sfnt_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 18212 bytes
SHA-256: d9f70d4bb085c006525d3bc20db63963c9d0fa28baf094244f737f8c0ba4a72b
font_02_sfnt_off000110be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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