Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73110b950845881…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 14:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e2cb3baada439ca4938fd3035e621b4 SHA-1: b298dfa3d5c45b8c266d9350af7456d9cc4a19e5 SHA-256: e73110b950845881a7017dd8d5618c27bf03f52248ec3859fd239335ced971af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic findings reveal it functions as a link farm, containing numerous external URIs pointing to potentially malicious domains. The document body is heavily obfuscated, but the presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=adam+sandler+just+go+with+it PDF link annotation
    • http://twfindia.in/userfiles/files/nonazatogomerop.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/2vadab5q1fnila51pd2s3u0vvf/82151343325.pdfIn PDF document text
    • http://adice-area.com/pictures/files/10172311238.pdfIn PDF document text
    • http://vpsystem.com/files/fck/ladutemomusokokunaguriko.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/73505935564.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161411bc104b23---jisulu.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/94180135613.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/78612216035.pdfIn PDF document text
    • http://nessium.net/userfiles/file/21873636968.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/batenaw.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/69583222227.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/23207909673.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/13576473074.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210903145819.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/85445513077.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/15057316688.pdfIn PDF document text
    • http://belv.ru/userfiles/file/zojatoju.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/zixerunave.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/90326964806.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/35978576659.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/16061208630.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/99198873360.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/xuzosavowasinosuxef.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/sidomoxiluzibakobir.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_off0000e64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64B 10992 bytes
SHA-256: 8ce78428ccd3103230effd7ec237166be6e18ea807c2b98bd4e435ec94b13a92
font_01_sfnt_off0000ff6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 18572 bytes
SHA-256: be5c5d61912f1c7fcab8b46156798d73e7f84d11f56b57520faacfffea1bb8d7
font_02_sfnt_off00012fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.