Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad54d7675798943…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 13:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ff8aebc3e35844f3ea5d3dd5d2e2f46 SHA-1: bfa061e130d27b9ab8f35b92014afda8ffd11557 SHA-256: 2ad54d76757989435e251a743fa422abc727819b3883c978ca07e242e4af0b8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, particularly the one identified as a link farm, suggest an attempt to direct users to potentially harmful content. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://aqcorth.specialty-match.com/upload/files/zovaxewaxejelafenunogi.pdf In PDF document text
    • https://mkart.it/uploads/file/26368455677.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/66417123098.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/87050710102.pdfIn PDF document text
    • http://humanlitech.com/files/files/80669458647.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161400148e5a7c---93458607491.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe0672830f---83341666845.pdfIn PDF document text
    • http://okun.su/upload/file/kesulasewef.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/runutaf.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/fegopupovuwojidokoj.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/35400443918.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/26031167414.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/dusajopakunedojadod.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/71152255503.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/pagelasujenanoxexemawa.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/noxisisutew.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/fovasabijeruvabozozebogod.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/dojekolukunenusawakujabe.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/31255410514.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210910_041243.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/sotobisaxojije.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210916/files/20210916070950.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/37800486578.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/34857268239.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/wediramej.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/77425683286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=straight+talk+on+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_off0000dfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 18404 bytes
SHA-256: 065c0aca9976bf39f39e93a38162d6a5d4a2edb7d34ac0b69aba95c5404e7aaa
font_01_sfnt_off00010ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EB 10396 bytes
SHA-256: 794633f8d5166ff15572fdd69f1872eabbf514adcd8e70a34558f5a1b1c217fb