Malicious PDF — malware analysis report

Static analysis result for SHA-256 f530b8ff06d60a93…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 10:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 290060181b2a506acc5e838a2ca10860 SHA-1: 0b0f0a667f937a0048a55143ec6145223d575d75 SHA-256: f530b8ff06d60a93064a64193040457f379f64364ae55fba4784c8fa6cc07d31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to disposable hosting, and one specifically uses a UTM term redirector, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=among+us+single+player+free+play PDF link annotation
    • http://maychebiengoduykhuong.com/media/ftp/file/tejowukariwumamonava.pdfIn PDF document text
    • http://lamay.de/userfiles/file/wipaweremejumunobeno.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/78551981681.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/35115828833.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/18776212236.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/tapezetadifejarubiton.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/52420874318.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210917163185622362.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/927ac9577021d345aef1680e261ed56c/98278140708.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137c5ef349ab---kaziba.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/16440247514.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/34578244147.pdfIn PDF document text
    • https://mkontroll.hu/File/pimenolexizo.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/saxezigaxuduwimudosulif.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/tegelapevedugeg.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/votetitesepazilev.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/teligufemalikofebapuva.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/waniwidofizub.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/vafokixegakajelegajipinod.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/98580856499.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/vibafozopewuwateja.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/58892794705.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/51822033048.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/58377222775.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://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_off0000c919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 17280 bytes
SHA-256: 26d6b06368b16c225bcf4c6922e4d5861a47dd84aeb61edb4873753ee7d67a88
font_02_sfnt_off00010e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E14 10796 bytes
SHA-256: e37b978ffeeea9647a99314c0ce65e037a241007d4c9ebbda9fa4c28354cf6c8

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