Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf2efce743ee76e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 13:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d75b9b820b77aba838de8225f2d54b7a SHA-1: 5cfb52705f3718ff91b2ff69cd52853fe2b12008 SHA-256: abf2efce743ee76e1f1d75bce66d87b0f3d42bf0df6f6248fd0375cc67344665
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning. The presence of numerous distinct PDF links, many on disposable domains, suggests a link farm designed to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://tortugafilms.ca/adminfiles/file/dafawifexaz.pdf In PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/kuxinimita.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210906180502.pdfIn PDF document text
    • http://indexone.ru/upload/file/xizovesisavofewadaw.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/25893187831.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/87568913755.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/mebetajugukebilifefigum.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/87145051705.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/mulamukabi.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137603fa7fba---10126834476.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/sadawes.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/1039750034.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/xolufitagosesonunolig.pdfIn PDF document text
    • http://prota.ru/upload/files/73299398491.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/18871957135.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/dapavubofepagoj.pdfIn PDF document text
    • https://labelmarket.pl/data/file/vibinoz.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613164c4da2af---85117681309.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/17336087948.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/vesunirexer.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/mivasolefajoki.pdfIn PDF document text
    • http://ukrfirework.com/images/file/48203793056.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/6540694658.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/59006316054.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/95380944305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+unlock+android+phone+after+too+many+pin+attempts+without+factory+resetPDF 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_off0000d06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06B 19536 bytes
SHA-256: 6d21b645e34a4d8ecbf36d69964b82ceb6ef53471c808702a1cdd6b4567826a9
font_01_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4E 11268 bytes
SHA-256: 17bed3aea27907db1029afe3056da05e29923b4a072a18212d6f33b526978da1