Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4be932a8ea4e7e…

MALICIOUS

PDF

87.6 KB Created: 2021-02-18 16:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fcff0ef63046e25a1aa866a8fa9a67f5 SHA-1: d65a3ee2578c2362436f0f45a82492ca81376353 SHA-256: 8d4be932a8ea4e7e8122493b969faf87eaab08293461f72e443fb115634e492c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. One of the embedded URLs, https://jacksth.ru/strik?utm_term=yellow+dot+next+to+snapchat+app, is likely the primary lure. The document body is heavily obfuscated, but the presence of PDF-specific heuristics indicates it's designed to exploit PDF vulnerabilities or deliver malicious content.

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
  • 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.
  • 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.
  • 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://jacksth.ru/strik?utm_term=yellow+dot+next+to+snapchat+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484815/normal_602b71de3b2cb.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/jfsieUP/dr_web_security_space_life_license_key.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/eEN8vZE/find_switch_in_stock.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381531/normal_5fcaffe827970.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/ghjgggm/word_connect_answers_level_1990.pdfIn PDF document text
    • https://dewapapowirise.weebly.com/uploads/1/3/1/4/131438248/gavawivumiviwek.pdfIn PDF document text
    • http://peludofnor.fun/gst_authorised_signatory_letter_format_for_trusttgywt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371509/normal_5ffb7c1b95da8.pdfIn PDF document text
    • https://cdn.sqhk.co/japivuwali/hcjjNyB/4k_magic_fluid_simulation_program.pdfIn PDF document text
    • http://rajelakitapeki.iblogger.org/aiguille_du_midi_skiing_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/detazido/BnJijhb/39286250061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484632/normal_5fd3b8eeb0498.pdfIn PDF document text
    • http://theraisins.pro/a_l_p_answer_key_2018oppjw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://femodizabofowu.epizy.com/xodap.pdfIn PDF document text
    • http://bedegotix.epizy.com/lawopugexifugamolo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFB 5184 bytes
SHA-256: 43e6145e274c453eaad5b35e30dadd8179d1b2eb41b21b6949547f92e1407174
font_01_sfnt_off00012cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB5 10772 bytes
SHA-256: 8830ded78a29a0d81f332051ac12a62078bfef0d2b3c2c27373fc358f1f0d544

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