Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef535016b42c254…

MALICIOUS

PDF

76.9 KB Created: 2021-09-16 22:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 116f49545f6a4cbf65e53aaa380b8d15 SHA-1: ec7c29d74a3e9f04d72cfd4289402b3dc1dc3198 SHA-256: 7ef535016b42c254a5e5ee27c101060b5a9ae1d84693b9dd4ddf6dee1a057e7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning model as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=free+touch+vpn+apk PDF link annotation
    • http://danies.ru/ckfinder/userfiles/files/koximig.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/27565229970.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/pokuvuvasuvezuruvafob.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/21851714413.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vnt7m6rs2d3c5k3p7o0rpa2jb4/numokawupol.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/67427139700.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6be475f6b2314723b7bf5dcbd50f70ef/26164689643.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/kazovurimosakelij.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/44343361343.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/nafeserivusovevuweliwodut.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/5242080605.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/88376587247.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/waporamabug.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/71739123006.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/fatumixalurepefezaradoj.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/56119194360.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/joniluke.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/17697208881.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/jiwisaw.pdfIn PDF document text
    • http://gibisch.info/files/files/90171764511.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/57987778656.pdfIn PDF document text
    • http://gewald.ru/content/Files/fatefewerupuraxegezot.pdfIn PDF document text
    • https://anjingliar.com/contents/files/woluresenupitulobowos.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_off0000cecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 10400 bytes
SHA-256: 5bb8444c52db8f0b6b8c01e9a00327ef0280846ac0869cc63da5b7e0ecd67f96
font_02_sfnt_off0000fe5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5D 15784 bytes
SHA-256: 8484a65a1b49b37dbb285d45165af597fe125db888d8c39575760efa011548d6

Open this report in the interactive analyzer, or submit your own file for analysis.