Malicious PDF — malware analysis report

Static analysis result for SHA-256 b484186a7f16bfb5…

MALICIOUS

PDF

89.3 KB Created: 2021-09-23 18:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e26276be0d4dac5bfcd49ac73655cb57 SHA-1: ad4eddaab0b8d89b307fe4cb97f18fb8f9a5ce74 SHA-256: b484186a7f16bfb52d8d26bab45696da75a22865a076917b68b3668af3408c10
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content or exploits. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host numerous links, likely for phishing or malware distribution. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142288392422---90881173706.pdf In PDF document text
    • http://navigator-nsk.ru/userfiles/file/monotatakevewejetamir.pdfIn PDF document text
    • https://highrise.pl/file/7026344884.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/kikenekukasonilutax.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/18054941683.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/25954930751.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/92651506530.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/vobenobifatutudaluwadipow.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/vuwokadije.pdfIn PDF document text
    • https://asiapharma.la/files/files/weladosuxix.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/dugonodinufidovulu.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109171731234556.pdfIn PDF document text
    • http://hangquangauto.com/files/lunojotusaxin.pdfIn PDF document text
    • http://citlak.com/admin/UserFiles/file/turinupusug.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/25090221486.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/85122360984.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/zimutokomobek.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/85652105427.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/77629965961.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adf55b4dcd---dowavodovoten.pdfIn PDF document text
    • https://duvanco.be/docs/files/jatanotilelazogowomoralos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+umbrella+academy+comic+pdfPDF 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_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 10832 bytes
SHA-256: c9c2d6526c51d2fef7ba5eb114fa559cfb2a3189d1eaecc6d6c822b46e622420
font_01_sfnt_off00010a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 20560 bytes
SHA-256: 5e219d7f6621b089f33dd3b26dcdb6f24c6aaf5b56dc880d6057cd2e47d376f0
font_02_sfnt_off00013fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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