Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07fab59834dcfcb…

MALICIOUS

PDF

84.1 KB Created: 2021-09-15 13:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed02d9fc34e89b851995ae787271e4d5 SHA-1: 99730257cbbf183c2fd949f465924c2e4bd9ba7d SHA-256: c07fab59834dcfcbb23b9b8ec9779d018a14f7541d45a5f16bcd316df8ddf628
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains, many of which appear to be disposable. This suggests a phishing or malware distribution scheme where the initial PDF serves as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://refpecsbelvaros.hu/kepek/files/46823554296.pdf In PDF document text
    • http://oilmachineydy.com/d/files/5696153584.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/64446897875.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/xofewimiduxapineb.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10443612590.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/40589803068.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/jinukinoxi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7pefmc231r02fjrh4kcm4ao8e2/bolefoluder.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb02d34f2---99017176599.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/pobisinexig.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/foveji.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/8110572396.pdfIn PDF document text
    • https://alohasafaris.com/files/jemonalinajazafajebuf.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/turotep.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/75489380310.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/nosudulika.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630681166.pdfIn PDF document text
    • http://boldogelet.hu/media/pavarewawexanefozop.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/81143954709.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/famadum.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/busawe.pdfIn PDF document text
    • https://baglab.pl/galeria/file/mifunalajituse.pdfIn PDF document text
    • http://ativn.com/upload/file/murupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=iphone+to+android+text+problemPDF 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_off0000e3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 18232 bytes
SHA-256: ca2802500e48bd92aadf7b01adccb49643826bb20408457ecaa8da46cf567f07
font_01_sfnt_off000112f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0D 10680 bytes
SHA-256: eebc3e25928415aecbcf70305559f9b6f5d2ebc5715c7151e7805d32352721be