Malicious PDF — malware analysis report

Static analysis result for SHA-256 9587736e16d4d595…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 21:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38a96ba97fffdb47723ec6a8cb75446f SHA-1: 1bdd98f53e7df4c9407571a928617d6e9027a4c6 SHA-256: 9587736e16d4d5952c6c53757c5150fed6c7ffeb008abb3b012497437482aa66
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an image lure and a clickable link to an algorithmically generated URL, typical of phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://hansungidschool.com/userfiles/file/84535798726.pdf In PDF document text
    • http://st-ark.it/userfiles/files/3759524578.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/48039317084.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/58181574054.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/2131010614.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/labetofepomelubuxezimat.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/58975187978.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/99552903050.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210913112958078.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/32247343947.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/ruvuti.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/ribopolaretimizisat.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/golonelerufomumevojakir.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/52165366731.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/vumisimerofez.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/11347036287.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/vezerome.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/xedefesevum.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16147af2a92822---84050696593.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109090833555828.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/pumalixigutesilijunaz.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/jabagigaxafowu.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/57046055847.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/fumesosajatajonapu.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/lisuzizewigajiwimugubeko.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/12167839783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=soccer+physics+onlinePDF 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_off0000b2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB13 10400 bytes
SHA-256: 75ddc6c0a9a0b92fe6bfc82b5f6c1be2705eb0f4cf31bd65d09e91b4b35e170b
font_02_sfnt_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 14560 bytes
SHA-256: ddfd2b491f2b9dd0be0511649b94a69a2f2c99f749e0493d52cbc8e96b06ddd3

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