Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad3a6d7adff1ee9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 08:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cdf6e92d0a0d0cd97150a735b9dc0cba SHA-1: bb5ba482a02baf370ed75d5bca1ac8e912f6c7f6 SHA-256: aad3a6d7adff1ee9a7120c93dc07e4b3614a488abdf1fa749873f86139655713
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs like 'https://nomylo.ru/uplcv?utm_term=minecraft+hack+download+free+mobile' suggest a phishing or scamming attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=minecraft+hack+download+free+mobile PDF link annotation
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/pufis.pdfIn PDF document text
    • http://ned.ru/uploads/files/rojivikunuduvixavuvenemog.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/vuliridegadizurelu.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/43375145657.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/xemulej.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/91728903923.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/21897415263.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/sanutodawamusewin.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/57526058238.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/zugepetoluledegitok.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/37829933738.pdfIn PDF document text
    • http://guowangcable.com/d/files/19163667058.pdfIn PDF document text
    • http://axwelindia.com/uploads/36094302081.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/82085198297.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/lafupovugeliketo.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/vulewanegiwelegod.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vagodizewibavexomowuki.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bdc9849d2---repokogazor.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/83234395007.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/67601141682.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/39443582287.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/94985084772.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613111b9ea7f1---kafuwalulorusixesigusitew.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/biditogenubulojere.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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 17624 bytes
SHA-256: 64466ba773981a8e8caa36064d2d45587fb5750b7af69c16efb7d22573e7d3ab
font_01_sfnt_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 10884 bytes
SHA-256: 5896e5bee5cabc0cc5e5aaa94e3759d1edfc30807cd12406440ad809139f49c1
font_02_sfnt_off0001219b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1