Malicious PDF — malware analysis report

Static analysis result for SHA-256 f219e36bd6ea838c…

MALICIOUS

PDF

75.9 KB Created: 2021-03-16 20:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bf5c386d0bf5aa821f8a49ef27a08fa6 SHA-1: 3037f7f515cf06206ab5f5219e30ca3acc51561f SHA-256: f219e36bd6ea838ce8eaa6650b8e010fd2dc964b251c63af9555af9ead3b3fa5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9998

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 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.
  • 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://zajinet.ru/wix?keyword=mendelian+genetics+worksheet+key PDF link annotation
    • https://xorukulimuz.weebly.com/uploads/1/3/4/7/134728044/6773084.pdfIn PDF document text
    • https://manoxumumaxu.weebly.com/uploads/1/3/4/4/134472756/8281601.pdfIn PDF document text
    • http://fatimuze.22web.org/79968144806.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/noxonakinugonej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kefodek/mojakurij.pdfIn PDF document text
    • http://zodotisejomiga.epizy.com/acurite_professional_weather_station_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/mowekizekuxojud.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/wunofufanir.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/how_to_assemble_magic_bullet_juicer.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/advanced_english_speaking_course_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/anisette_std_bold_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/what_is_sat_medical_test.pdfIn PDF document text
    • http://bemerufupatovi.rf.gd/formato_para_hacer_un_carnet_de_identificacion.pdfIn PDF document text
    • http://jejomozukiro.rf.gd/international_mailing_address_format_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/famokilifepobafubematop.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/bipizafazebej.pdfIn PDF document text
    • http://wusozupit.myartsonline.com/7416401628.pdfIn PDF document text
    • http://gisesufuxezemud.epizy.com/songwriting_for_dummies_free_download.pdfIn PDF document text
    • http://sonapap.rf.gd/blending_words_for_grade_1.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AA 5464 bytes
SHA-256: 9443c7be5d86323ad2658ab901b6cf08e0902a703455cfa3711058b332d5fe68
font_01_sfnt_off0000e65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65E 11264 bytes
SHA-256: 34d0acb6d0bb8fc3d439cdfc10c957b5a6ba184048278e91078eb49370edad51
font_02_sfnt_off00010cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF1 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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