Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b038d95eca99639…

MALICIOUS

PDF

80.2 KB Created: 2021-05-29 14:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48f67a8e3bd17267ea537a49dee9b888 SHA-1: 9d3eb5341f64789dffa56dc4580d760e7844c49f SHA-256: 8b038d95eca9963990a740bab3dec67f83fa74a52d31cd759743d3a6fb74832e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which are part of a link farm, and is flagged by ML classifiers and ClamAV as malicious. The presence of a 'download button' lure and an MFA harvesting lure suggests a phishing or credential theft attempt. The embedded URL likely leads to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/wb?keyword=ring%20doorbell%20wifi%20button%20not%20working
    • https://cdn-cms.f-static.net/uploads/4386852/normal_606d1996e6d54.pdf
    • https://xoxizanelanoruf.weebly.com/uploads/1/3/0/7/130740612/b14b3c9f34f2.pdf
    • https://judorobizud.weebly.com/uploads/1/3/4/4/134455398/nasezo.pdf
    • https://cdn-cms.f-static.net/uploads/4467027/normal_5fd639927caa3.pdf
    • https://cdn-cms.f-static.net/uploads/4446045/normal_601adea323b34.pdf
    • https://dogopakuva.weebly.com/uploads/1/3/4/6/134698139/6ef19308.pdf
    • https://tajamopem.weebly.com/uploads/1/3/4/7/134745730/viporafox.pdf
    • https://pebabozepevi.weebly.com/uploads/1/3/5/9/135966679/a692e23b58.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/34d98def-63b5-446e-97f1-073505c4a9b5/remixatezofogin.pdf
    • https://uploads.strikinglycdn.com/files/bd9b7c37-6cc2-444c-8e30-d9b3d1583f55/vizio_32_inch_tv_1080p_manual.pdf
    • https://uploads.strikinglycdn.com/files/d4075f4f-76d8-4268-8255-62609cf72021/lonomusonumibepita.pdf
    • https://uploads.strikinglycdn.com/files/e196d758-b2f6-4b59-8e31-93df3c5db13c/edexcel_igcse_biology_textbook_answers.pdf
    • https://uploads.strikinglycdn.com/files/7bdc21c9-8c4f-48d1-ab78-963766f8e58f/56206432811.pdf
    • https://uploads.strikinglycdn.com/files/fee318be-b079-4eda-b944-d4f3b3e94fe2/how_to_open_paint_in_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/077437a1-4d60-4798-aed9-a440fc1b5659/jolejenajeji.pdf
    • https://uploads.strikinglycdn.com/files/44531c2b-1d66-4805-ba28-487ec50caf41/how_to_do_egg_diet_for_weight_loss.pdf
    • https://uploads.strikinglycdn.com/files/f34ee9b6-e1c4-4dcf-b858-d5b03fc3e8b7/wikadidif.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd18.bin
903ddcfea774ab4b4bca3beadb68ac82fdf8489b1c271fa3afc96744c38e3afc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 4992 bytes
font_01_sfnt_off00010e3f.bin
bdb04e15d1b277ec8f13967d7634ac7b5b5064aac637f6435aa2315755f2dff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 10964 bytes

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