Malicious PDF — malware analysis report

Static analysis result for SHA-256 4096cd499396f863…

MALICIOUS

PDF

70.9 KB Created: 2021-09-12 22:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ed7887d2d92814ec6f4fa0dd4a99a015 SHA-1: cbedc99404d6d4d660900efc25e02384501ce80f SHA-256: 4096cd499396f863c4013f7cd905a5a558c2d178a46752003d56d6a0e258f756
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 http://sriagasthiyarastro.com/FCKeditor/userfiles/file/85182273057.pdf In PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/27415136895.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/jalizedugefojiwepupeko.pdfIn PDF document text
    • http://kvrhousing.com/uploads/bubegegipivujuligor.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/34280030678.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/femirosadesuvaziwap.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/siwokoxofa.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/10007509915.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/sunerovubidedux.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/pekaduwajewamizipo.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/88930434456.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/33710311375.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376866afe86---kuminofunuvozesobewefo.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c77d174b8b3d1acf490ae34249837d79/notigejibepetobaf.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/34843875561.pdfIn PDF document text
    • https://onecre.com/images/content/files/zitigizegokovu.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/nugofapijevubogapi.pdfIn PDF document text
    • https://linker.tw/files/wogerexajinovojes.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/xafivubuji.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/5217934107.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/48017943030.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/85025593461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=vpn+green+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_off0000b4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E7 16924 bytes
SHA-256: 81dc0820d1c34fb66e86d2fa61d536def36ee87137032d353407ea95ff44d39f
font_01_sfnt_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 9964 bytes
SHA-256: 9b65b12f9d3554703c80d7fe479b485951c3b5505e22adf46923235ac1e513f8

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