Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f5e1cc770e60cc…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 02:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d35f194a169249b8a22eaf20f2af425 SHA-1: f014bf53c32cd3b0149acdf35a11cc628bd8cc00 SHA-256: 89f5e1cc770e60cc77181227c58d9c446addae257a31f7501b6f2dcdb4998aa2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=feudal+japan+social+pyramid PDF link annotation
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210909092225.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/zudeleragopapumotasa.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/22561945221.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/bikulazam.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/bijegobitipegujuso.pdfIn PDF document text
    • https://clubon.top/uploads/files/48741804195.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/8434357412.pdfIn PDF document text
    • http://119pump.net/d/files/15261140936.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/1347536256.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/sivabukikagureretu.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/juxenexipizatuwipir.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/28888410030.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/nedute.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/1372792789.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090412233439.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/31738953234.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfb5eb90ed---sumasij.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/11981102886.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/7d530d0a603d02bba366f998276ff7d7/vaposi.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/tumokazexipiwazabefejex.pdfIn PDF document text
    • http://mp-journal.com/media/file/kukonupidazepuj.pdfIn PDF document text
    • http://generaldistco.com/images/file/21598542895.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/46476361220.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/bovalovowejubetelufe.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/18644415640.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_off0000e4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 16980 bytes
SHA-256: 8a96dc49233b3a9a2ac1f8e89dffe5ed01483168644152039ac80b63914cdeed
font_02_sfnt_off000128bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BF 10900 bytes
SHA-256: 5b1484279b541433b7567b08c470d5403e360e838363d5dba896ff90af877e3e