Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d4be1d7737fecf…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 15:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 36391479e69002fc1b13e9e5e3bc9c60 SHA-1: 37452eb39a5aec704d4961362edce729dd71d876 SHA-256: 58d4be1d7737fecf6bc9c28191233ccc09cf5378b7193e07faff0e30e4bd9d46
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to execute code within the document, potentially to facilitate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=play+store+latest+version+2020 PDF link annotation
    • https://bank-kredit.at/ckfinder/userfiles/files/lamuv.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/52042724300.pdfIn PDF document text
    • http://canadianrockies.info/files/file/45947225556.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/19094907445.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/zadarolopiwiteruzoso.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/fizegeso.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/cu78gnujtv8se5gfnr20qj9fu5/mulumetodujudi.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/xinuxamujuzatavulebade.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/podoxasuposajixapo.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/32622660125.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/xuvovupekojurinoxenixis.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/36641016677.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/legujezidifarufujozukovep.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/nigame.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/72641998969.pdfIn PDF document text
    • https://5udua.com/contents/files/50997498923.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/vitesamukasiramuduvem.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/57826079215.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa06c62a72---39203127542.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/xidokixe.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/86630186711.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/77188091661.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/monemajonaliwoxopiw.pdfIn PDF document text
    • 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_off0000dca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA1 17780 bytes
SHA-256: 299714b804588b0b7d45f488e0d82f7f4a8ea661cbce84d1804bf6a0dfec58d4
font_01_sfnt_off00010ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E5 10524 bytes
SHA-256: bf3c111968f876e538f859350d9ae0a4e65d093a87bc993e5e871f9dbd0afc86