Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f636ee00100682…

MALICIOUS

PDF

71.8 KB Created: 2021-09-23 04:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c9ad6afa3246d2c1c3afbd89b21d6a3c SHA-1: 01d810fc8a39d36c9e2224bfbf4af416f7e3b464 SHA-256: 57f636ee00100682bd847f01cbbda0f6bf7609dacf9b849b99367355e8138d5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, with one heuristic specifically identifying it as a link farm on disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a tactic to obscure the true destination or distribute malware across multiple sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://xlpe.net/Images_upload/files/giwukitodi.pdf In PDF document text
    • http://bwc.lt/i/96918614703.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/43715510550.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/juwewivijavot.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/fezefesoladufobuwuma.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/dunum.pdfIn PDF document text
    • http://prosquash.by/data/zumiwuxikewogenibive.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/7444515504.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0fa9344e2---53190567552.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/5221539029.pdfIn PDF document text
    • http://househouse.it/userfiles/files/65938967320.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/94606137558.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/mojakuzezamaxopimizu.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/fileralomisemotumi.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///tubakifosolina.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/8649213759.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8027020f0---76456051219.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/58738758807.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_22_04_31_01_1803.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/dutaragekuwetumeda.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/xexuwasutigiwidetagofivez.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16146e05b220b6---jerogilewedizusuwe.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/natokep.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/42903979729.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/10677242170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tamil+movies+mx+playerPDF 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_off0000bab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB4 10456 bytes
SHA-256: 0e709316b893d659692d94ca508961cb96f3ef1a107cc66d6315d6d411ab783e
font_01_sfnt_off0000d278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD278 15424 bytes
SHA-256: 05e9d3071469b14c14205e0d5f0eadcf6e387ec10b62528ef00a833b9ae29ad9
font_02_sfnt_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1