Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad81c542c6f8895…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 02:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ebfd6dffacbca5d78e5c47ae41909a9e SHA-1: 3e6c84c6c925917ddb4f3354b08bfed644d41713 SHA-256: 1ad81c542c6f8895822807f840fdf5b1307875c83e66c0c278ac51d740396cab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct, potentially malicious websites. The presence of embedded URLs further supports this, likely serving as lures for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=western+skyrim+main+quest PDF link annotation
    • http://alpanelektrik.com/depo/sayfaresim/file/26241121430.pdfIn PDF document text
    • http://kentacademymiango.com/userfiles/file/79881556001.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210908010825.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/kozagu.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/pozerovarawalazolutitok.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/totixumebezevajo.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/zobetedazejuxozipenizaf.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/55964161651.pdfIn PDF document text
    • http://primaneighbors.com/userimages/38296370271.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/307b0d1a3182d7e173e771049c0d2b59/xovisuduberugube.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/570313505.pdfIn PDF document text
    • http://ore-processing.ru/d/files/68002590538.pdfIn PDF document text
    • http://chromoink.com/updates/file/sevefegag.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/lapusavidemegamidezu.pdfIn PDF document text
    • https://matkinhantai.com/luutru/files/saxoleketetasa.pdfIn PDF document text
    • http://megalaserasia.com/upload///xiduzosimaxatowanoxajak.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/vawus.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/fojuledutajuferig.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210903143158.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/39407043177.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/wirelewuwiwulinedaxom.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630824624_1.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_off0000df7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7E 10548 bytes
SHA-256: 22a7325a59bf21ec727f35aea66ec43a8ed8d9cae5cf48fe81b9e99015a2c660
font_01_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 17556 bytes
SHA-256: 53f496dd9da0dc512ef3f5588329c602850807339c22a360ff62f7fa9ebbdb7e
font_02_sfnt_off000124ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.