Malicious PDF — malware analysis report

Static analysis result for SHA-256 987a14b2a0e76bcc…

MALICIOUS

PDF

88.4 KB Created: 2021-09-17 04:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d3bcaf59b81c176f58bedc10d3e501f SHA-1: f48570c75487840a40c92b745655ceaf44c29cfc SHA-256: 987a14b2a0e76bcc3816f2b029cdfcb8cf8259a3168e5cd2c95265c547f17281
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files, suggesting a link farm or redirection mechanism. The heuristic 'SE_SECURITY_BYPASS' indicates the document attempts to instruct the user to disable security software, a common tactic in phishing and malware delivery. While no scripts were explicitly extracted, the presence of embedded URLs and the security bypass attempt strongly suggest a malicious intent to lead the user to a compromised site or download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kahounova.cz/userfiles/file/58289435506.pdf In PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/bogigumidonurig.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614047547fbe5---zijopamizebilefubimulalax.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/68867066894.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/54892140491.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/lutog.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/8shlqk74f4oiie7oc7cbm3287k/mesusivo.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/dukexerowajixiwedexab.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/nogoseduden.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210904_9890d.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/zanitarajoxosinuwile.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/potuwotofimugizibineb.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/64509808760.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/53461883262.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/jateratewadabazuzapex.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/pejotasazawapelorevabupi.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/77629891874.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/60065017285.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/12857583159.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/tefer.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/jalebibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=apk+trader+life+simulatorPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 17832 bytes
SHA-256: 89d41a7155fe96d33587b1c229f4f5c34e2e31c8476d34b5c4c1752d77ca873f
font_01_sfnt_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 17988 bytes
SHA-256: 16d00c5b169d3d7276b3b799e03ed38c21abdcf10d44f3b9a6d9663e1a94c132
font_02_sfnt_off00012158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12158 10728 bytes
SHA-256: 9dc90db87d565660eecc55fcc4e052b1a3b58843017d28ef19c7a29e4d3b03d2
font_03_sfnt_off00013a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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