Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3ccfcc9cf89bad…

MALICIOUS

PDF

67.7 KB Created: 2021-09-24 10:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30678abb1933246cfd1ec52bdf7dc48c SHA-1: 6680501ac37ca9cf6e01206e5b673ef0f1ddabfc SHA-256: 8e3ccfcc9cf89bad09a134666a22385ea1151f579036d67981d2d2d286401318
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, directing users to numerous external URLs, one of which is associated with a download lure. Although no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=download+memoji+for+android PDF link annotation
    • https://bczenekar.hu/files/file/koxemamidolojo.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/38665986029.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210920_C36D5D83D29E101D.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091708225199.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/417605185613a9e76d9de1.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/vitelokajosijerewiwepaz.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/24235003452.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/55983314171.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/vaduzinalupivigapogu.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/90907310520.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/nivewebav.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/zesurinebofotevonagodi.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c449ec781d1e4e102ab881dc0abbb2c8/71109454753.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/36285986897.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/59381807576.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/7749197582.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/95959966956.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/ferezo.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/fugujovuzafofikojozuxuna.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/disewizenoxozifaxamu.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_off0000ac9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC9D 14644 bytes
SHA-256: c1f3ed0bf16b3ac427f27a46fb9a60745755a86302eacfb1156ef15b0224a9bf
font_01_sfnt_off0000d151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD151 10464 bytes
SHA-256: 19194657c9c52d2fbb9c607b89a7c73a3719da76ca1f11aac4df170924742baf
font_02_sfnt_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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