Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e10b1080da4a80…

MALICIOUS

PDF

78.1 KB Created: 2021-09-19 18:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 66813f3057010f571b7bc022fdf34829 SHA-1: f7ccc4cbcc8f8e03d53d85f48432ad78c693cdb0 SHA-256: 13e10b1080da4a800da23dfd9d5552783a69715a080eaa31e6e73a0530a9c5ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous embedded URLs, many of which point to potentially disposable hosting or are part of a link farm, suggesting a phishing or scamming operation. The presence of external URIs and the overall structure strongly indicate an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=interaction+design+by+jennifer+preece+helen+sharp+and+yvonne+rogers+pdf PDF link annotation
    • http://clubmaniacr.com/campannas/file/kotexagumoruxajujoxobaled.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/89127585120.pdfIn PDF document text
    • https://mlspoland.co/files/file/58763097528.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/46448935046.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/73439302877.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091320150349.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/98147204620.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/gisamijufajoxado.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/winawikegeze.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/35849226220.pdfIn PDF document text
    • http://mosjob.ru/images/file/xisazemaxu.pdfIn PDF document text
    • https://dhesient.com/media/lapuxozukem.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/10537809878.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/tubalepizotutikidif.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/wipubusobawabawid.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614575312b695---76345660516.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/nalitonakefoduzerupu.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/retepuvumakatamiwutaje.pdfIn PDF document text
    • https://kultmotor.hu/images/files/55894438054.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/24854131833.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/21619218803.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_off0000c846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE058 18356 bytes
SHA-256: 68689155df4b72a9874540b7f0cd1b982f6535c0b2726afaa9864e981971a8ad
font_02_sfnt_off0001103d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103D 11300 bytes
SHA-256: 92035093acc5ded5122b7b4b77efa785ded8ae074fa63af3f80d0d02f88cbe73

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