Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f73c79888235ec…

MALICIOUS

PDF

79.4 KB Created: 2021-09-12 18:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: daeffb695879721d27fecc700f802d20 SHA-1: f9d5c80bd95f591f530546e98dbcf8edfaf9261f SHA-256: 53f73c79888235ec888485852f24f2921c4817ccd87f8ac1a17e17127f3337dd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as evidenced by the numerous suspicious links found, including one that appears to be a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=how+to+transfer+music+from+itunes+to+android PDF link annotation
    • http://cassotech.nl/site/data/ws/files/pemuxinenoledetak.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/kuvozovaj.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/vafaf.pdfIn PDF document text
    • https://linker.tw/files/nusepipe.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/vulevobuzawisuzijad.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/97541792237.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/966939021.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/migelibageme.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/65869299958.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/26351165990.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/xafovuli.pdfIn PDF document text
    • http://calisnt.com/uploads/files/75324372130.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bc921211b---kelewisisuwow.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/7ffa687f861bbcb6614d18317cd591e6/52521263650.pdfIn PDF document text
    • http://houselandia.ru/files/56360607682.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/38834084792.pdfIn PDF document text
    • http://shahgrp.com/uploads/54366178791.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/wukexedipesirume.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/najibesuzumutotutivejo.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/8740021962.pdfIn PDF document text
    • https://mihalex.by/files/files/jigurinu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 17804 bytes
SHA-256: d2f4b1d73c328341ce677db3239c79be9ef50024c19d53f11f80b1e3e816e723
font_02_sfnt_off0001170c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170C 10768 bytes
SHA-256: 36ce21a0b44d9ecb9a5524efbaf852fc6796b7a80ef971d71ff28e511e0aa064

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