Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62732377652f849…

MALICIOUS

PDF

72.3 KB Created: 2021-09-19 10:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d70ae4fb887f8add2010c7acb1bc053 SHA-1: 27250ab44bd1293b95e88bb86186e5e06fcbda3a SHA-256: d62732377652f849b19c2dc1f1b787f1db26221bf6f7a695f928afdc9696d104
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's designed to host numerous links on disposable domains, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://noithathoaphat11.com/upload/files/44334891827.pdf In PDF document text
    • https://fzclicks.com/demo/files/editor/file/85812776367.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/54526087248.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/xilam.pdfIn PDF document text
    • http://becucci.it/userfiles/files/15368673076.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/84116027491.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/9832016028.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145f54a30fff---wutudenakazuzuxez.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/7781d18d5c2a9686b0d5fde8a7fb9f8d/81603258283.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109170636223908.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/wisalonogufazagutep.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/vimivolasanurutiba.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/sekegij.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/55852146471.pdfIn PDF document text
    • http://laserinnsbruck.com/static/93061604008.pdfIn PDF document text
    • http://vtaky.sk/media/file/rutabazi.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/31051590045.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/pufijimobulisajis.pdfIn PDF document text
    • http://eternoohydro.com/d/files/jozakonirajomomobokosip.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/sigekosixawo.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/wikuwov.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/8469028948.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/28766886713.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/72961840127.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/34481059859.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/60851677283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=drum+game+apkPDF 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_off0000b8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C1 17280 bytes
SHA-256: 25c877cfb5e68d34fc5b1963848a15b8057194957e0b0f5de57dae92f9925288
font_01_sfnt_off0000e522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 10160 bytes
SHA-256: 077eac0cd37857e11aa25705d3f2f91fb00d9d52a76a75caf92f3fb4021ce528
font_02_sfnt_off0000fbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1