Malicious PDF — malware analysis report

Static analysis result for SHA-256 04daad742e3ab74e…

MALICIOUS

PDF

72.8 KB Created: 2021-09-14 11:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bddb1dac9efb314fe6a88f0942f5f424 SHA-1: 4b147e7ceb5dd4136389953d3ce55dfd11a39592 SHA-256: 04daad742e3ab74e4fbec768885bab9b6f898770ef2d0dd84363cab34daf1224
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with high confidence. It contains a large number of embedded URLs, many of which point to disposable hosting, indicating a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically calls out this behavior. While no scripts were extracted, the presence of numerous external URIs suggests the document's primary purpose is to lead users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=gudiya+patola+punjabi+film PDF link annotation
    • http://cungcapbaoduongcuanhatban.com/upload/files/rajipo.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/wadotumidigip.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/mitakupamotegimoz.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/30233263891.pdfIn PDF document text
    • http://friulanapanini.com/images/file/18211158940.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3gtgidjo8edm3g3sk7si27d3q6/816056540.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/tapafirojevajepugovomife.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jirima.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/77306381088.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210911_070909.pdfIn PDF document text
    • https://biodez.lt/i/File/gujawabawen.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/41947433841.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/noguzudebasoxixopi.pdfIn PDF document text
    • https://andrejc.si/files/file/23688366448.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/45504608912.pdfIn PDF document text
    • http://i-dron.cz/data/file/zetivabovenefamusulop.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/tiwiwijusuvijosivifu.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/70545824214.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fafc0d818a---merotiwuwemijaju.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/lezapiwalixama.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/97648724665.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/76685238688.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_off0000b9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FC 16896 bytes
SHA-256: b93c112b97af5ed1c61b95c74e886fda8f3862fdaa9e9d8c8f268e4373198b27
font_02_sfnt_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 10780 bytes
SHA-256: d362ba2eea28b6f1aaf4a9e0dd4842d6d3c054effbe15a85ce787de7557bf631

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