Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d91a791db8dcd3d…

MALICIOUS

PDF

73.5 KB Created: 2021-02-26 22:22:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 0d8896e1684d5f49fbf98128ce59933c SHA-1: 41998dcfb890c23ea9a77c0f157f15bd735ec24e SHA-256: 6d91a791db8dcd3dd22ca06714b7f5c6ea602edd56a0dc493bb5e62dcba94ab5
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism to host malicious content. The presence of external URIs and the ML classification strongly indicate a phishing or malware distribution attempt.

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
  • 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://kuzutuzo.ru/strik?utm_term=bible+verses+with+explanation+pdf PDF link annotation
    • http://alsamcctv.com/my_little_pony_in_the_sims_download_free47sn1.pdfIn PDF document text
    • http://hamsterbig.com/pancake_art_gameeu8f3.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/oracle_sql_multiple_rows_to_comma_separated_column.pdfIn PDF document text
    • http://worldhold.online/why_did_the_puritans_settle_in_the_new_england_colonies56van.pdfIn PDF document text
    • http://tvoyoproc.fun/nalelovegutn0ftu.pdfIn PDF document text
    • http://jushq.club/lart_de_la_guerre_sun_tzu_fnac6ayu8.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/jj1Tyie/gemitasejule.pdfIn PDF document text
    • http://lienforkid.com/jobesisuwowowofoxafogio90c.pdfIn PDF document text
    • https://cdn.sqhk.co/vojofarakiva/iqhghjh/power_hover_hack_apk.pdfIn PDF document text
    • http://xruhdfo.site/tiwewimogafidouekqp.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/jixuro.pdfIn PDF document text
    • http://springwin.space/where_is_the_transmission_fluid_dipstick_on_a_2002_ford_exploreri3g6w.pdfIn PDF document text
    • https://cdn.sqhk.co/sebidurubuze/4OjjJC4/20152452262.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lumosaneja.onlinewebshop.net/1969_ford_mustang_mach_1_price_in_india.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_off0000e30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 5540 bytes
SHA-256: 143f1b2eea65aa07c84dd9bb104f37f9fbe205e199c904b9b6b1b6eeeb19de17
font_01_sfnt_off0000f5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 10500 bytes
SHA-256: b14176033611eefd99fe9bf3b17cec6d93dc29df6799ad02f2511c82390900a2

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