Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e37369ae8367ce8…

MALICIOUS

PDF

78.2 KB Created: 2021-09-09 12:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 326322c4f697ef647d568ec1503d84a0 SHA-1: 9838622a914baa567fd1c775fb8397c274235424 SHA-256: 7e37369ae8367ce8b8cd606df9debb778118aed25fa41a4465b85313f5a2c8c8
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, specifically indicating phishing and trojan activity. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting sites, suggesting a phishing or malware distribution attempt. While no scripts were extracted, the presence of many unknown URLs points to a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vandientuchinhhang.com/upload/files/71495440215.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb67423f05---kewagolid.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/fafowawaboxeb.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/1229071350.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/lekunegamawavo.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/2739573631.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/vonosemivutemu.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/93674136541.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210902015306.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/kogigubumuzewabi.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210904/file/16307251313717.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/kagulekini.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/29249954451.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/29072514574.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/17394512238.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/88766356561.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/vabonuvenatabe.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210901100311.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/totubi.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/94864002729.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/mevigeduxipag.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/wojudilimuxozudaj.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/dodalizarunij.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/zovuxomagabelef.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/7787605988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=is+perpetual+spinach+perennialPDF 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_off0000cf51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF51 17372 bytes
SHA-256: 5018258a114278f39e7bd6b3041a45c5a13f199d6a178a827de49a32f669b098
font_01_sfnt_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 10400 bytes
SHA-256: 6c3d8de4aef6dde004ec34025d0924c912f72222d83d2f7ba0b4a8402da42724
font_02_sfnt_off00011329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1