Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5b0a89ce16faab…

MALICIOUS

PDF

84.9 KB Created: 2021-09-12 02:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 20220b74de9c198a558510334355b2b2 SHA-1: 8e831175ff920b8e731572f2a3e2b3c36b0c824d SHA-256: 1d5b0a89ce16faab5d64488ae1ffb9e40a209c772375a68982f641fd969f28cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the nature of the embedded links and the PDF structure points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://ssp.by/var/upload/88067922756.pdf In PDF document text
    • http://fitviewer.biz/files/file/pasaletewiwim.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/27415136895.pdfIn PDF document text
    • https://digireg.nu/upload/65689185189.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/kadanutazebenukigubuw.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/nagufebodixotafa.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/52563547148.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/17284402302.pdfIn PDF document text
    • http://bjjiffy.com/upload/77624028070.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/14843971640.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/7402f70037f6d6d9738b92f7e27de190/48617931129.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/60432200952.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/18194551806.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/80393811742.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/95971589357.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137eda9ce33b---22789239214.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/70148271920.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/rowanotasisisov.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/datoje.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/wevomimum.pdfIn PDF document text
    • http://netart.hu/userfiles/file/dolaponipixi.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/67099835869.pdfIn PDF document text
    • http://ymmicro.com/files/files/jodilo.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/50632558956.pdfIn PDF document text
    • https://denimder.org/resimler/files/jibisagodufisodutatejid.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/vunokofoxup.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/93979339193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dirty+deeds+stella+rhys+read+onlinePDF 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_off0000e1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 10460 bytes
SHA-256: 60a3716cbd1a731be88064456a84c0e55440724035922c1775fc1dc584116757
font_01_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 19976 bytes
SHA-256: 8b3326d5e74ed92028c1f31f523bac49026ec8fd0992620c99aae80d0b5ac8b0
font_02_sfnt_off00012da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1