Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9dde5d55121ed8…

MALICIOUS

PDF

74.8 KB Created: 2021-09-12 17:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 320aa225cfc403de36da73d9f97c3cb0 SHA-1: 41db9016ec82817a306dcba85943036b5dc85ce2 SHA-256: 7c9dde5d55121ed819357b1dd1a7cded04b15f4ff44e7e2354de9663d04be641
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect the user to malicious content or facilitate a scam. The presence of multiple disposable link farm URLs further supports a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://gartenstadt-apotheke.com/userfiles/file/39923067559.pdf In PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/bokofivatilofolexasufoj.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/36850694368.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/95989516076.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/fuwizoniwojulu.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/jotaruwofaba.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/61305563397.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/76609687027.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/14960968788.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392f26e6097---wupenula.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/69402680342.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/s8va5n4mp2s07brm45np4pk31m/64677860093.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/worerap.pdfIn PDF document text
    • http://m2m2design.com/userfiles/9640227733.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/92469061923.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/26165452224.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/46301708373.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/40025951954.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/fasuma.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0904/40b05ad5169b10b92e001b0111206b42.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109091757452177.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/jevosidaf.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/tizejimugalelinosux.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/pukurozijenuviropexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=horse+live+wallpaperPDF 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://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_off0000c642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC642 17220 bytes
SHA-256: 79be1ffd4c17a6cfed872188d6ad05565b6cc33d7f8054baae8bea7d4064f77b
font_01_sfnt_off0000f284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 10184 bytes
SHA-256: a5bc0d9b11ebfca5e416be398e651656c7b01da1b817ecabad1b7d34e71a9037