Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f3181050cabd8e…

MALICIOUS

PDF

71.1 KB Created: 2021-02-03 01:17:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cc67037a890893c2233468cac9dbc923 SHA-1: d10c504a57161be9613adeb503f741db9f52fff9 SHA-256: 40f3181050cabd8e913227b542142532dc20da941e64513676b105efa9cd27c1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a phishing or scam attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or malware delivery. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=fried+egg+nutrition+data In PDF document text
    • https://dorenezawux.weebly.com/uploads/1/3/5/3/135383086/303e299de.pdfIn PDF document text
    • https://vefiwuzozubeki.weebly.com/uploads/1/3/0/9/130969791/wevitixu-jeneko-xobuninaja-todoju.pdfIn PDF document text
    • http://xulikugo.iblogger.org/59304200853.pdfIn PDF document text
    • https://kosodakugup.weebly.com/uploads/1/3/4/6/134655388/fotiguroma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5fe911e998d88.pdfIn PDF document text
    • https://cdn.sqhk.co/julukijowi/ejaODdH/online_coupons_deals_coupons_and_promo_codes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466153/normal_600d6cf7a6b7b.pdfIn PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/gg7iegd/ball_blast_hack_2019_ios.pdfIn PDF document text
    • https://fukaxoxatu.weebly.com/uploads/1/3/1/4/131438517/77150e11b08a38.pdfIn PDF document text
    • https://cdn.sqhk.co/miweguzeg/d8bhen5/tevobanisetom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487206/normal_6019dbf9b3e00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://popedufi.epizy.com/salesforce_matrix_report_conditional_highlighting.pdfIn PDF document text
    • http://vonisepo.epizy.com/business_interview_thank_you_letter_template.pdfIn PDF document text
    • http://rimalapotozuf.epizy.com/93788271885.pdfIn PDF document text
    • http://kiwuvapinemugi.rf.gd/episerver_forms_developer_guide.pdfIn PDF document text
    • http://riramemixezu.epizy.com/accident_report_today_n3.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 4740 bytes
SHA-256: 1571894f1d4e80d7b24f709a90c653a7ee24eba21cc0dc661b27032c1b284c50
font_01_sfnt_off0000e868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 11572 bytes
SHA-256: a35b6b6a7c5ffbb0ca3cb6458109505dc5a0476d0bd952ed517f42c2635ec75f

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