Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f89728fd79cc42…

MALICIOUS

PDF

71.4 KB Created: 2021-09-18 00:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fd46643be3424d8fcb44732c963aed20 SHA-1: f54f9bf84b86cea1f28c43dc65b04569e8ac6301 SHA-256: 78f89728fd79cc4231321425f0fa47eda2ebf16631fbe19c11960bcb398382dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are identified as a link farm on disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution attempt, aiming to trick users into downloading files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ruresept.ru/files/file/68130609012.pdf In PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/28637368064.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161396aa75d03d---85286618582.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/nuwofumovukubatelapa.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/gefijodemikikowulo.pdfIn PDF document text
    • https://kaimano.it/file/zomijerexurekasinuj.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/50771386205.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16143ede7960c1---nevinov.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/duvasofemibedoroximenela.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/11801634222.pdfIn PDF document text
    • https://fultoys.com/userfiles/wojepajid.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/fofonukubegesuxife.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/60888074949.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/789815213.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/31556429802.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210902_CFE3FF18219A778D.pdfIn PDF document text
    • http://texmet.pl/userimages/file/vudasaveje.pdfIn PDF document text
    • http://foodchemsino.com/d/files/98306088653.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/tupimipo.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/58218384132.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/25836602400.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/85527321600.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/22215821804.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/355422309.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/84073546358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=lucky+patcher+latest+downloadPDF 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_off0000b8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AC 10868 bytes
SHA-256: 8318972096972fdc748cb4aaf36201d9b5dd40d05c28ea07e0a226ff68f380d8
font_01_sfnt_off0000d1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA00 15064 bytes
SHA-256: cf829c753cd8c15a4ee6214b84599e76b6c441cb106433199658b48944cae3f9