Malicious PDF — malware analysis report

Static analysis result for SHA-256 6653cd36fbd8ddae…

MALICIOUS

PDF

83.1 KB Created: 2021-02-22 01:28:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a428c31821de41c5ead821654f8efa84 SHA-1: a68870bfed23c9d26fe27a3c9d8749c1af985a48 SHA-256: 6653cd36fbd8ddae656308edeea93b0f9573944faa2d3f486d9c140cf47b8b19
192 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to disposable domains, indicating a link farm designed to obscure the ultimate destination. One critical heuristic firing confirms that the PDF links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the overall structure and URL findings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=mushoku+tensei+light+novel+volume+9 In PDF document text
    • http://wunowixumofe.22web.org/check_string_is_json_format.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382408/normal_6005b464639a2.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/dhiBIDW/31347569944.pdfIn PDF document text
    • http://onenature.space/vezuj6i2v0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445106/normal_6021a3d89bc0e.pdfIn PDF document text
    • https://cdn.sqhk.co/womilepeba/Cz7gcgi/dilev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_602007f4489c6.pdfIn PDF document text
    • http://vomuniwawan.iblogger.org/8595505618.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/cHB3zyh/play_impossible_gameball_review.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/798268031124uz6w.pdfIn PDF document text
    • http://copyright-security-ig.com/patient_grand_corps_malade_fiche_de_lectureqniu9.pdfIn PDF document text
    • https://cdn.sqhk.co/mimofeto/7pVNmjg/sales_day_book_template_excel_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gogewarixisude.epizy.com/divaraponovikuni.pdfIn PDF document text
    • http://viveguwoxifug.epizy.com/campodeiform_larvae_image.pdfIn PDF document text
    • http://kejefutipetube.epizy.com/jexotaxazanulabose.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 4920 bytes
SHA-256: 47a18fcafe3b5d2bac74db2f702f41389db9fbf036edfcb25e6576de10162e71
font_01_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 5080 bytes
SHA-256: 3c1a7bfac24bdc2856bc889d69ea1650f500de3c49a8ce63578de1ed6b5c1e8e
font_02_sfnt_off00011204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 15508 bytes
SHA-256: 38ebe5ae2581494992f874996e8f62ac5338fb81926423d9f1440738450d6ae5

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