Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc42625e7d35ac71…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 12:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ed1b0ac73e7bf7ca9e4948ba830cceef SHA-1: e9a607ecc17a38805d33fa19fb7b032817acd239 SHA-256: dc42625e7d35ac7174e9764d75e9cbb4623bad05014be4120489c1913977dad0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests a link farm designed to obscure the ultimate destination or to host multiple lures. The 'SE_DOWNLOAD_BUTTON' heuristic indicates a visual call-to-action, reinforcing the phishing or malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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 https://b2bircruise.travflex.com/bot/ckfinder/uf/files/81476904282.pdf In PDF document text
    • http://hytechcommunications.com/userfiles/file/tixudililojevarabugisa.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/tevilozoruwisedofub.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/topelobez.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/79935980329.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/93128086456.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210910_D43C5CAF1D52C470.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/33180090005.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/fubewenixin.pdfIn PDF document text
    • http://topstec.com/d/files/neforidonujud.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/72182856979.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/51898912647.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/wizojax.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/rasuvobejijurodeg.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/28038034675.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/bitupunutalibarutazo.pdfIn PDF document text
    • https://salonrewards.ca/images/file/temedofusutik.pdfIn PDF document text
    • http://goldmustang.ru/files/files/wojiruzugizagexejudofexax.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/63945474268.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/36578615466.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/pozofizegafizilowetevos.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/xabupu.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=death+city+zombie+invasion+mod+apkPDF 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_off0000d526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 11108 bytes
SHA-256: 92e9e409bad42d9d7a4c041377f4e64962342328cdd6050af12f6e032e81ed8f
font_02_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 17720 bytes
SHA-256: 12a2a472540a51dcf9d9abbc079849807aeb901eaea5cac61071fcce7c9ee96f

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