Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f957e0688dd4c0e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 03:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 56829973adddbc20ef9130d9cf3f8652 SHA-1: cb6217b754a460700d1f816d69bf459a86e74e56 SHA-256: 4f957e0688dd4c0ee8e3e5dd184b129d228ac0173c09a1f896e33669d510b2ee
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous external URIs, including one disguised as a software update link, and a link farm heuristic indicates a high volume of links to disposable hosting. The presence of these elements suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=moto+e4+latest+update PDF link annotation
    • http://dvarenda.ru/upload/file/binowizepuva.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/40955439581.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b896d936be---83409855515.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/64377032984.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/43677921121.pdfIn PDF document text
    • http://nanopena.cz/upload/file/nojipulesoded.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/67673614569.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xidomadukif.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/bomomazetomipize.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210916113406.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/jakefefiwifesorotugiw.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631185861.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/sosamipevilejotiga.pdfIn PDF document text
    • https://33mobility.net/uploads/files/16036461550.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/wenibesiwekonasakaruvut.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/teboxaninerena.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/vekimitibupes.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/94131145990.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/vijuwalen.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210903_A630D8712A0E4B96.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360580ab06e---38747295737.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/nizamodujiwubowaxafeba.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/nurulofumirud.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/27810448880.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_off0000db46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 10260 bytes
SHA-256: 62d8c90f57723c00a23bd61ba7db928e5e4f4e0825daad7fd9313d3afb2ee62d
font_02_sfnt_off00010aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 18312 bytes
SHA-256: 2a29ae1fa8e165aa16877df45e0e7dcbf1918093af777f1bfd76d7f9d7a530e4