Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4dd6284cbb1501…

MALICIOUS

PDF

97.2 KB Created: 2021-09-21 01:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ab9640a478de88cd5b8a31dce354c234 SHA-1: ca35d329b83e37ae2c31c341d35eab0693801679 SHA-256: ab4dd6284cbb1501b6583a6148b51ac64957e97fc570476abe518c17ddd2bf8c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://theseadiaries.com/ckfinder/userfiles/files/98986742626.pdf In PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/dinunewubakoregote.pdfIn PDF document text
    • http://calisnt.com/uploads/files/goruvividesorixise.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/18354235406.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/33055699439.pdfIn PDF document text
    • https://granitnet.hu/editor_up/gunivovojuto.pdfIn PDF document text
    • http://lgassociates.in/uploads/35952758313.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/74540082211.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/wefuduj.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/72541716812.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/8376512579.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/sisotipafilapuzizi.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/bonowarutivalasaxediwiv.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/xasaxonigojojuzagejud.pdfIn PDF document text
    • https://isosklo.cz/uploads/silodev.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/c9a9cd1094f911ea7d1caef0ed0a1a37/96016416781.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/2048278731.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/41115811704.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/49027151210.pdfIn PDF document text
    • http://quinta.cl/upload/files/miditugupupaxekolazasopom.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/kepamezum.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/lasajenikerisugifinenoxi.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109170648595527.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614354d27b888---55120126097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=download+lego+ninjago+the+final+battle+for+androidPDF 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_off0001123d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123D 10824 bytes
SHA-256: 8b60ea1523699e43e2bac930b9d21196244993bb6127c3547b61196153dc9b68
font_01_sfnt_off00012ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F0 19740 bytes
SHA-256: a92c917b812f4888fab2b03bdbd70c7f8ef91569b896ccda3bc7487eadf9b8dc