Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d40b322cb222fb4…

MALICIOUS

PDF

85.5 KB Created: 2021-03-19 19:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 48bcc91ed956c6d2cff00b2d470e771d SHA-1: 2ed7b16fdffbfcdba419c3f6fe4620ce8cd1a845 SHA-256: 2d40b322cb222fb4ba91b408d49bc5013b3a549fba0a06d6375b980f03e3a676
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The document's content, though heavily obfuscated, suggests a social engineering attempt to trick the user into installing a browser extension or update. The presence of numerous external links, many pointing to disposable hosting, indicates a link farm designed to redirect users to potentially malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gimoguvi.ru/award?keyword=i+dreamed+a+dream+piano+sheet+pdf PDF link annotation
    • http://voirlo.xyz/how_to_install_hp_envy_5530_printer_without_cdmpu9d.pdfIn PDF document text
    • http://cyberlife.store/cash_dividends_paid_to_common_stockholders10uym.pdfIn PDF document text
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/9f103deb58efd7.pdfIn PDF document text
    • http://mihetos.xyz/788385256tye5n.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/fusionner_les_fichiers_en_ligne.pdfIn PDF document text
    • http://riniwodifole.medianewsonline.com/auditoria_contable_peru.pdfIn PDF document text
    • http://devicesprotectionforusers.site/zibojiwusekufeiqinx.pdfIn PDF document text
    • https://tifozofazok.weebly.com/uploads/1/3/1/3/131383738/0cfc4c83bb7a4.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/femileleguzukujugurut.pdfIn PDF document text
    • https://liruviwogaralo.weebly.com/uploads/1/3/0/7/130776788/vaxumejujewadivala.pdfIn PDF document text
    • http://lukiduxipapep.mywebcommunity.org/exam_master_current_affairs_2020.pdfIn PDF document text
    • http://kzrovk.xyz/que_significa_educacion_superior_completaiz779.pdfIn PDF document text
    • https://degezikesobito.weebly.com/uploads/1/3/1/3/131384018/raxakep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_180c46f2657244f6adcb28c1538cf4fd.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_159a796e9c3f45609f40cf9703c60886.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wusone/battery_percentage_android_pie.pdfIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_b7a7df4344574bce816fb83edd65279d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitok/android_versions_list_with_names.pdfIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_f08714acab58428d90388857d113d8dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/zobomedisimipupavatax.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
    • https://www.musicnotes.com/l/tM3FQIn 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://scripts.sil.org/OFLIn 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_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 5188 bytes
SHA-256: 308cfbfc92704db5a456a183c31d6ce7ad74bf67c9d1d6c7adef8248817dc78a
font_01_sfnt_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 2668 bytes
SHA-256: c84483043f2bd9a80322ae634095982022c970d1adc59b3c26074de7a5152737
font_02_sfnt_off00010a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9E 11524 bytes
SHA-256: 4fa00847e70d860134d1a4cec3d2f5a7a6de7e947d25dc43ac9d975202b04a5f
font_03_sfnt_off0001318c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318C 16060 bytes
SHA-256: df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210

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