Malicious PDF — malware analysis report

Static analysis result for SHA-256 3452b559bd70f2b9…

MALICIOUS

PDF

91.5 KB Created: 2021-03-28 15:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: bb0a848e40fba6589c0d24ef5c8b422b SHA-1: a6b5bec53a8c8a64971523bbd75520749972860c SHA-256: 3452b559bd70f2b9cb1dc7f048d6f11f9c3c6149c4d4d11874971967a75e07c6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier returned a high probability of maliciousness. Numerous external URIs were extracted, many pointing to disposable hosting or link farms, suggesting an attempt to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the presence of embedded URIs and the overall heuristic firings indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://bologen.ru/wix?keyword=solfege+hand+signs+video PDF link annotation
    • https://cdn.sqhk.co/xivomojuf/CH0VggX/pencil_case_box_buttons.pdfIn PDF document text
    • http://zuluguvo.iblogger.org/41955505109.pdfIn PDF document text
    • http://xipodijajul.sportsontheweb.net/los_elementos_una_historia_ilustrada_de_la_tabla_periodica.pdfIn PDF document text
    • https://cdn.sqhk.co/rosubeno/uljfIdM/zusekivasigitidilopuwo.pdfIn PDF document text
    • http://tepifugamokeg.medianewsonline.com/72193484014.pdfIn PDF document text
    • http://gobigs.space/fotapifebinogitu5tpv4.pdfIn PDF document text
    • http://fakurivevid.scienceontheweb.net/ranujulibixepuje.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/hghvJza/the_last_stand_2013_trailer.pdfIn PDF document text
    • http://fbdirect.site/symbol_technologies_scanner_batteryfs2v0.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvevalor/IhgL4gj/best_buy_las_vegas_summerlin.pdfIn PDF document text
    • http://sowadegepixu.22web.org/gupuzegirokususitorediso.pdfIn PDF document text
    • https://cdn.sqhk.co/juxezijafoz/heaghKR/toreb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kilarosine.atwebpages.com/zejapexapojigoxogoliropub.pdfIn PDF document text
    • http://bezopiwuzalobit.rf.gd/georgia_car_bill_of_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a1a9c7-e6bc-4b0a-b0fc-b4f4dc7b0f5c/70452890389.pdfIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_10d29adc00544c1aa24911b48527c3f3.pdf?index=trueIn PDF document text
    • http://xotepugiz.rf.gd/dewalt_xr_circular_saw_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/385d1760-655e-49ae-8e46-75ea00a53619/fixejuzelixegov.pdfIn PDF document text
    • http://kabekexivebinef.epizy.com/tadinorudozozoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04fc99b3-408b-4873-9bee-6eddbdaa5368/70285384699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b6b98d9-4e58-4f97-baba-bf2d6675944b/20259778735.pdfIn PDF document text
    • http://kuwitabetegipo.myartsonline.com/aso_admissional.pdfIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_9a77388770834849b92896d198f55cdb.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 4944 bytes
SHA-256: 053e6e386e8988d311afc52062be5cc3ab1901a20a304550c2808558556f21c0
font_01_sfnt_off00011569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11569 11436 bytes
SHA-256: 3bc197bc28878b61832ea6a624b73631a441335dac8c786756ee66a910fc3960
font_02_sfnt_off00013cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAE 16276 bytes
SHA-256: ff00edb760403f214424b712c8292f0c5e585b2f2134709747623296cf473f6d
font_03_sfnt_off00015228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15228 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378