Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d2b48e5fef7b9d…

MALICIOUS

PDF

75.7 KB Created: 2021-09-10 08:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4779b65ebe6afc2aed43809e095a944 SHA-1: b7354f0d31a589b299951c417a64d60004630ca8 SHA-256: 49d2b48e5fef7b9d7b7e1ae78d1ab306202bf26d5a61c6221dcfaa0fdd72fe76
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to PDF files on potentially disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript (T1059.007) indicates an attempt to execute code within the PDF viewer, likely to redirect the user to malicious sites or download further payloads. The overall behavior suggests a phishing or malware distribution campaign, consistent with Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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 http://immobilieninvestors.com/userfiles/file/wezakijebuta.pdf In PDF document text
    • https://learn-atdi.com/uploads/files/95469085286.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210902215118_gjjkp7.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/bobixaji.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95649641494.pdfIn PDF document text
    • http://domuran.pl/files/file/193520225.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/beduritavizimomatuxeziri.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210909231031_jpvnwu.pdfIn PDF document text
    • https://emenu.hu/editor_up/24010282926.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136194353e9b---mekaje.pdfIn PDF document text
    • http://synowka.pl/galeria/file/putoranobogobikusixas.pdfIn PDF document text
    • http://vaynhe.com/upload/files/kowamug.pdfIn PDF document text
    • https://12tiga.com/contents/files/21222410479.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/36022219046.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/fozifizexi.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/25359301373.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021921193711.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/zawojafifininebupawubiw.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/869d485e5a810df1db9f2e1627742d03/96214737662.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/vuturelozupepavujedurox.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/bitufaxodabinifarolil.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/57841814462.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/45855815587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fidget+spinner+io+onlinePDF 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_off0000bf0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0F 19152 bytes
SHA-256: 0e04dbc632f3adfaceb7a07f1488165bcd4ecc8eb0f08700be42f32b35fb0bfb
font_01_sfnt_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 10384 bytes
SHA-256: bb8c739a0f281cd1aa8052aa28b100123735962c60a21dbfa18c93d134dbd240
font_02_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1