Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfc94586dbbc66b…

MALICIOUS

PDF

85.9 KB Created: 2021-09-20 07:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0be02bad65d9906fc2fb080d8cd42b1 SHA-1: c7688a24122a9b14204eac5a0f821de83b35acae SHA-256: 3cfc94586dbbc66bc7ca0c8556606d5b3a9a4e3cd308a5def45a8b98b74f73ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs and the PDF's structure suggest it is designed to redirect users to potentially malicious sites, likely as part of a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://oniceh.ru/uplcv?utm_term=free+textbook+pdf PDF link annotation
    • http://hglobaltour.com/FileData/ckfinder/files/20210912_CECDDB820CEA6E95.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/72165126330.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/faxonasunegote.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/kudokawamadupexulujanodu.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/rufefeker.pdfIn PDF document text
    • https://denimder.org/resimler/files/vujafameniradozato.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/wixagubuxodasar.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/59761388927.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/wabunixifudo.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/pojesonat.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/12650998704.pdfIn PDF document text
    • http://trevorhannant.com/duwuxexowasovarev.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zesowalifiguroba.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/goxakexevimureketewug.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/wasam.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/zalavidezadojuxin.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/likovutegexitelo.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/dodalizarunij.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/31871583955.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/90978590984.pdfIn PDF document text
    • http://erimti.com/userfiles/file/jurunelulanufedagovo.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/2950739114.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/12hfrj42l7blp9b7ni55pne0mo/sesapeboge.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/deladasetesaxenasudujo.pdfIn PDF document text
    • http://santehnika34.ru/images/file/88264092528.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/dowitibagojiwibuma.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/289051948.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_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 10228 bytes
SHA-256: 6af48bdc929f31e7a72367fc9fca92ac9626eac928e9112dd5edc2c4a54de321
font_01_sfnt_off00010349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 18060 bytes
SHA-256: 1f99d6fb3721d92a8352696b02b592a63ceb7eca9e3aa3e3dd1ea2de9ff897e4
font_02_sfnt_off000131ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1