Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43423584378fde3…

MALICIOUS

PDF

88.3 KB Created: 2021-09-08 19:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bafdd0d32f7bce773ade21b809b5070e SHA-1: 6a044985f6c010554934d36a421b11b20501c6db SHA-256: c43423584378fde3010b7bf70925250e073e0772d82f4f13549e973e5504822a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to potentially malicious PDF files, suggesting a link farm or distribution mechanism for further payloads. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://adtw1.elfjane.com/ckfinder/userfiles/files/84266961793.pdf In PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/xifafutojetap.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210903195354.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/901397022.pdfIn PDF document text
    • http://saint-party.com/media/file/kukuzesavafakexa.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lajanebedokudido.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/vumejezuxuxexufez.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/43792071645.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/44313468359.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/fopemufu.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/mavekikojexifa.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/jewefiladudusupivupavaz.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210901142143.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bbf36a47---xerupifogukuzikalit.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/fetiruver.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/76710115232.pdfIn PDF document text
    • http://eternaseguros.net/files/files/1298431109.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/rexudobifojovaxonetu.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138751d54f38---92276707.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/31818378819.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/60960010731.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/pavufime.pdfIn PDF document text
    • http://meditopthailand.com/file/bebalafugi.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/94101498487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+sedona+method+new+workbook.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_off0000ec51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10463 20696 bytes
SHA-256: cb0dfa293f5ff93ed16a89d5f3d465abeeaedda807b562be0a3a0c0b36b15ae7
font_02_sfnt_off00013af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF7 10972 bytes
SHA-256: 6462e79cf2655267ac9df32061aa15f129c20d79aa4f25368aaccd2016e540ee