Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef849cc694b633b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 07:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 71895a7e6ae0604f36a3cd89ea05e5d0 SHA-1: e091de06d13a017dfd4816435196755903dd0841 SHA-256: aef849cc694b633bc90ca0416e090573389580c2ab67be5cb2afe2080b54c49d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, many of which point to PDFs hosted on potentially disposable domains. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/jfqk5lv9bt73k01gkq9mskd2ng/girimaguvexufiwozekeferin.pdf In PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c002a8b0b---34076950446.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/gufenoworug.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/75718252145.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/kezijitunim.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/lerirokew.pdfIn PDF document text
    • https://slide-bearing.com/d/files/66996929044.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/63809771712.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/68448629019.pdfIn PDF document text
    • http://surestegc.org/documentos/file/vizogijuzu.pdfIn PDF document text
    • http://mextro.de/upload/files/20700372072.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/xizuwofagekapigudupen.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/zageretil.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/31058442014.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/fifusodugatipemelazotel.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/wosisigitupitunuguwelud.pdfIn PDF document text
    • http://preiss.at/upload_files/files/xavizonolononutinir.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/87566911372.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/zifutom.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/36575978027.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/50610768626.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/tasoluf.pdfIn PDF document text
    • http://esen.life/userfiles/file/jewarurutixejona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+password+unlockerPDF 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_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 10668 bytes
SHA-256: 0988011b9a59f07cb40f3c58addfc7d76f9ea3d5ea320d9274f1795fd7599ac0
font_02_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 18528 bytes
SHA-256: 045d9686b0d45250c3a7133c45e679a5af902828fc1adc260f358b9bf30dea16