Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e6765bb767c383…

MALICIOUS

PDF

74.1 KB Created: 2021-02-23 22:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 33d2b5859ed5e27657e4b3e5d6d49e6a SHA-1: 4452d361d646944215bcd8aba4af2e522bff83d3 SHA-256: 15e6765bb767c38389c95d4283dccbb9f87151a466422c575243cd3c01dd8ccd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to 'anatomy and physiology study guide answer key'. The presence of external URIs indicates an attempt to redirect the user to malicious websites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=anatomy+and+physiology+study+guide+answer+key PDF link annotation
    • http://ccckkkkk.space/51083758828nye8u.pdfIn PDF document text
    • http://fitit.space/dyson_cinetic_big_ball_animal_vacuum_filter_cleaning7m8zb.pdfIn PDF document text
    • https://cdn.sqhk.co/taduzotul/DsjgOjm/david_letterman_top_10_lists_template.pdfIn PDF document text
    • http://tiktokhd.design/5451464381i4l0q.pdfIn PDF document text
    • https://cdn.sqhk.co/pagupuxu/x7jaZGh/equalizer_pro_app_apk.pdfIn PDF document text
    • http://nudistoff.club/bozodadwj92.pdfIn PDF document text
    • https://cdn.sqhk.co/fekerepusa/mjfrur2/26819410903.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/jbhcieP/funny_friendship_quotes_in_english_for_whatsapp_status.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/ialjfby/30543699115.pdfIn PDF document text
    • http://sberbank.services/stickwars_stickman_fighting_gameswkukn.pdfIn PDF document text
    • http://tranquils.space/netgear_gs108pe_specificationsaqs8u.pdfIn PDF document text
    • https://cdn.sqhk.co/xuteposidobi/fAV1hc7/immigration_and_nationality_act_section_212_e.pdfIn PDF document text
    • http://bet-info.ru/viwuseronomigozabonep0gg8.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/gjlIdhh/7719517158.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/29267227726.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/86267992146.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_off0000e518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE518 5620 bytes
SHA-256: fc0019ae0c2e8a77ae215e5c2776bc48c0b0697981a2379e1121324966b40101
font_01_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 10160 bytes
SHA-256: b11b0986bc08c482d1e9ec66377a68b898261a8696784d6f74588fd69ec81095

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