Malicious PDF — malware analysis report

Static analysis result for SHA-256 184a2a45c6753aa8…

MALICIOUS

PDF

84.9 KB Created: 2021-09-12 22:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dec2ea8c93f4c398a6a93ed8bcd8b6e8 SHA-1: 73e82a29c4c41c5c79da517d1d708cdfe18d10dc SHA-256: 184a2a45c6753aa89f6f16c9f02ffebc89abe1b897e31d2b3f07e9eea6a31252
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one with a 'utm_term' parameter suggesting a tracking or phishing lure. The PDF structure and embedded links point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=car+mechanic+apk+download PDF link annotation
    • https://smartech.lv/sites/smartech/uploads/documents/files/82269717607.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/8475734368.pdfIn PDF document text
    • http://bienbao.org/uploads/files/zatigutifatij.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/7401276582.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/negojazidino.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/83166867548.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/ditezupapatedo.pdfIn PDF document text
    • http://moristas.com/userfiles/files/tobusatu.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/71369480077.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/kblsgrmhs60mh1t9o7ajui5vnh/99200723037.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/kizifaniwojujubolax.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/11780756241.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/pavogax.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135ae91d172b---rokometuxetotigozofi.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/26448518259.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/29006791184.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/22437241056.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109082053438636.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/tiranalip.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/tusazipixopusuxe.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/levikejenajak.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/46307589923.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/kiwajavenedezele.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/88412067663.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210907_D08EC6975F7B1E3F.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_off0000e68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA1 18264 bytes
SHA-256: ce14e7ba337fabbcfc29c855c008a35099a2f6ecbd8634c358485ebd03bc0b41
font_02_sfnt_off00012da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA2 10720 bytes
SHA-256: f18c835390884454035eeb431aa423b92bd41d43ec4f951b93d9d75d291c7ff4