Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24cca8b5a5136c4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 16:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d95d8e96766e08c1e14b4a71ef326ac8 SHA-1: fb7a0f03261dddb0ba4624181b5becb053c7b6a7 SHA-256: c24cca8b5a5136c418036c9464edf4535d976990fb3aaabbbdffbe8a097472ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting and link farms, indicating a phishing or redirection scheme. The PDF structure and embedded content suggest it is designed to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://queure.ru/uplcv?utm_term=universe+sandbox+free+android PDF link annotation
    • https://organicearthfiji.com/documents/file/vigolosegisijexutekoni.pdfIn PDF document text
    • http://receptlap.hu/files/kujekitugibedazudorit.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/nuzediwabu.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/godepopurenikizepom.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/likejutomazimewukuvin.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/35761875817.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/42045878290.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/g3u76svfptvuiekf5ii9pqfql2/27157610109.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/79952899162.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390ec34a993---77352133048.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/6924649645.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/romenakagatapixilufogor.pdfIn PDF document text
    • https://thietbigas.net/media/files/83527916079.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/98875198048.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/xuredibidisuwomanelazuran.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/nenagirelonotalejulivom.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/gebavevedisenevudani.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/tavapofinedomasu.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210906043247410.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/xomovebom.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/xegapujovupomixi.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109011529425006.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/37666183148.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/90832625047.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210903_C53CEFF149C3C851.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_off0000d4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F0 17744 bytes
SHA-256: 790889d3910c920c4d51334749f0cccc5742a0c055ae5c5d85d11941fdcfc552
font_01_sfnt_off0001033e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033E 10516 bytes
SHA-256: 4cc4e67cce588b0f3c237ad3f451bea0fd3094ebf32106c44569596f737fcedf
font_02_sfnt_off00011b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1