Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8a8826157f96e8…

MALICIOUS

PDF

74.5 KB Created: 2021-02-22 01:35:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 01454144381b8c17b41512b3584455ea SHA-1: f051fcacbae3d78f818510a7f6f130ea3377bcfc SHA-256: 6b8a8826157f96e8eb7218dc1abb891fc7d395c6736a0ceb3960ca84d507dcda
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to disposable domains and known malicious redirectors, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/strik?utm_term=introvert+mbti+personality+type In PDF document text
    • http://wegansit.space/823380249099pbjc.pdfIn PDF document text
    • http://qiwi-wallet.online/gap_certificate_affidavit_format_in_marathizp9x2.pdfIn PDF document text
    • http://salet.store/discharge_letter_templategrak8.pdfIn PDF document text
    • https://cdn.sqhk.co/vunofufi/HXhigjh/apple_watch_series_5_40mm_band_length.pdfIn PDF document text
    • http://topitoxituzoju.iblogger.org/steve_siebold_how_the_rich_think_download.pdfIn PDF document text
    • http://lusivemewuza.22web.org/clash_royale_latest_update_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490369/normal_6020c3dad067f.pdfIn PDF document text
    • https://cdn.sqhk.co/mofekuma/dtZhg6I/xumiridozekug.pdfIn PDF document text
    • http://8gusevshop.space/foolproof_module_3_test_answers_quizletkuqlq.pdfIn PDF document text
    • http://ompala.store/curva_de_calibracion_ejercicios_resueltos00s0l.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/ggMBIjf/23260212294.pdfIn PDF document text
    • http://kpupnov.pro/evaluating_the_twelve_tables_of_early_roman_law_answersd5dvb.pdfIn PDF document text
    • http://korsabarca.com/megan_rapinoe_wifeo2q42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_5fd79d3ae68d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dufemeg.epizy.com/53528412266.pdfIn PDF document text
    • http://dudowowadoz.rf.gd/mekewakepukapibonup.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD018 5204 bytes
SHA-256: 7b93b99142c17ade40a3bab4fc5f0e63f47a1c8f2cffc9ab8b9f3956949a93ea
font_01_sfnt_off0000e1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B4 11808 bytes
SHA-256: ab039f83d13b0b61c23ce817663f2e2845bdc4342ce5335683012fcb4defd75c
font_02_sfnt_off00010802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10802 16088 bytes
SHA-256: 55ee31f2b9c575572aca401957c5cf2f3b57b55b1dd57d1bb6d1e144d3512b41

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