Malicious PDF — malware analysis report

Static analysis result for SHA-256 72db4f0c8ed2db14…

MALICIOUS

PDF

83.0 KB Created: 2021-09-14 10:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7412dcdf6d1aabc9a870e5a7bf5bf1f6 SHA-1: 14a3880e1b57ec6c2c9af293cf29035737d4540d SHA-256: 72db4f0c8ed2db14b534bb31bbfaeb1e37f7860b2e6f2d5e68084f9a656f14a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting a phishing or SEO manipulation scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to create a network of links on potentially untrusted hosting.

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 http://www.w.radeton.cz/ckfinder/userfiles/files/82228023437.pdf In PDF document text
    • https://luckyfood.itweald.com/uploads/files/6134b1233ce14.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/4680621303.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/tomovobekepuwejomazapu.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/48106094653.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38757651816.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3b1rd4p91c774t0tgbg3e21bhg/91711333475.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/dorejilemabu.pdfIn PDF document text
    • http://videlec.be/ressource/file/90649464208.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/jexonitenilul.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/12446961999.pdfIn PDF document text
    • http://jsdarvin.com/files/texagemufutebevotike.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/36663855690.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/51029275218.pdfIn PDF document text
    • http://irths.com/upload_files/files/kevemunusazodetajal.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/5735645388.pdfIn PDF document text
    • https://epiphanych.com/images/file/favemalaxuta.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/jumisolanugilif.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/88987195347.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210908155412.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/zudakuruzubemefon.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/mekunakapoma.pdfIn PDF document text
    • https://conrays.ru/f/data/deturakifasudiw.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/1974988507.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161379db4af697---wiregekadesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+pomodoro+technique+pdfPDF 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_off0000e180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 10716 bytes
SHA-256: c906ddde59b74c36cdbbb2797927590036528e38ba0ab0c165c2a657682276a0
font_01_sfnt_off0000f9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BD 17396 bytes
SHA-256: 51b42cb3d9e7959d022b0fd74fefd64d77387100dc2f73ad16d0e3fbb6e95baf