Malicious PDF — malware analysis report

Static analysis result for SHA-256 7649382dc9fbc73b…

MALICIOUS

PDF

75.5 KB Created: 2021-05-17 05:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: abdbc7df48ca58309673d537e91983b8 SHA-1: 4476134109ea8723a9f5cf36976169d4b7b16853 SHA-256: 7649382dc9fbc73b1ed1c25565c615c34fe656d5e92c5a2af550e0d7990b6a9f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The primary malicious URL identified is https://midufefew.ru/strik, which is likely used to serve the next stage of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/strik?utm_term=un+grito+desesperado+carlos+cuauhtemoc+sanchez+resumen PDF link annotation
    • https://visoxifa.weebly.com/uploads/1/3/2/7/132740860/9173873.pdfIn PDF document text
    • https://kigokevorusom.weebly.com/uploads/1/3/4/7/134709893/2571756.pdfIn PDF document text
    • http://yoga-italy.space/cossacks_game_iphoneagja9.pdfIn PDF document text
    • http://mybiol.site/16095225127ykdyi.pdfIn PDF document text
    • https://nazisedisan.weebly.com/uploads/1/3/1/8/131871674/9709285.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/2030502.pdfIn PDF document text
    • http://2220202.ru/nidiveror51u1e.pdfIn PDF document text
    • http://meriline.store/derrida_artaudqh5t9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_f801a77096474c6cb6a4305b3a92a1da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/73b0fc53-7362-4f17-b5a6-ff41ddc9b214/mizitawidupebakabovufagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59688a02-7855-489b-8560-2eebedae0a56/how_to_start_quadra_fire_pellet_stove.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_cd5348a4f74e4cb8af04a75394b60cf1.pdf?index=trueIn PDF document text
    • https://245df057-3761-468b-8bc4-2c9c6734f7c7.filesusr.com/ugd/06c8e1_ce037a97ac1f485da95eb0d8cec83e72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f5e9e3a-9b0e-4177-bb57-3118b40d1af4/creative_writing_topics_for_school_students.pdfIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_135be4723a764c3bae024b40e08f43ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3f2228-6855-42e6-b22f-688950e02195/349434431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b340cd2-c168-4c22-a5ad-fa92b43b06a6/79416051125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fffc9c96-f46c-42fd-882c-15c8f5f3c029/esl_assessment_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fca1254f-0220-42fe-ae65-9e2bacd8daec/godejinezelavopeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/147bc2b4-f8ee-4862-8b17-86f48a5cd87d/explain_the_different_types_of_research_tools.pdfIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_bb358d4336244a218eefeac1ca5925be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cfce86a-773a-415a-a9ef-cc30623a0d5e/lakudokawex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60661355-51cb-436b-befd-e1483517df41/diagrama_de_fases_hierro_carbon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d19c0b4b-bb08-415f-8f10-5f217350cb64/7368162267.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_off0000eae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 5528 bytes
SHA-256: 9d3f9919905bc81a87ecebad6f79a081bc00f2002a269d2dc773c209ea9c4e74
font_01_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 10984 bytes
SHA-256: cec6f4fa992ab01553675859f3f2f725435be8bb97b329b8eeb8b54c8577d7a7

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