Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5923b2591fc7f50…

MALICIOUS

PDF

84.4 KB Created: 2021-03-23 03:50:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 488eb9ff669881324122284ca204dd19 SHA-1: e944d63d6045b451172cdfd6d45437ecf1df863e SHA-256: b5923b2591fc7f505de6cdbfeda712e61d00f32a0155b1af9cfeeec6cb11b52f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to potentially malicious domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious. The presence of embedded URLs and the heuristic PDF_SEO_LINK_FARM strongly suggest this document is designed to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=marshall+mg100fx+head+and+cab
    • http://nuloriwilorij.scienceontheweb.net/59664285433.pdf
    • http://nokasosozigof.mypressonline.com/samsung_wf42h5200ap_a2_filter_cleaning.pdf
    • http://poposiruta.mywebcommunity.org/40334292975.pdf
    • http://gugolufixa.mywebcommunity.org/12026124405.pdf
    • http://kizunawinim.getenjoyment.net/kajexupu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/timeziso/88211572613.pdf
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_0ad5f51243d849b5b60216e577ff90ea.pdf?index=true
    • http://wuriwafu.epizy.com/company_profile_template_bootstrap_free.pdf
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_125e4762bab446c0908a5d00bc17c99a.pdf?index=true
    • https://s3.amazonaws.com/fadobirak/cool_acrylic_painting_ideas_easy.pdf
    • http://jufalemel.rf.gd/notuzi.pdf
    • https://s3.amazonaws.com/wizidimawag/jurassic_park_builder.pdf
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_118c0e40cf834db0848babc84342b9ff.pdf?index=true
    • https://uploads.strikinglycdn.com/files/14114f37-fd71-4055-9eb3-e7179e6f6041/21369715803.pdf
    • https://s3.amazonaws.com/zosevid/28567030520.pdf
    • https://s3.amazonaws.com/vavabi/ballerina_leap_full_movie_free.pdf
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_2210daf9dc354527bff3fd8d1d5441fb.pdf?index=true
    • https://s3.amazonaws.com/minegikukovel/sekofedojubuxuzepipogufev.pdf
    • https://s3.amazonaws.com/zibenoroduzuw/motorola_bluetooth_headset_s10-hd_pairing.pdf
    • https://uploads.strikinglycdn.com/files/09d0bd9f-d04d-4ab3-b7c1-251a42912a90/los_juegos_del_hambre_en_llamas_pelicula_completa_espaol.pdf
    • https://s3.amazonaws.com/fasudikek/what_is_the_tone_of_the_poem_a_man_falls_to_his_death.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb98.bin
83ba881500e39e4bc591b00a12f559ccf505b27e1f83b36b52ee2970e3a25993		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 5392 bytes
font_01_sfnt_off00010dc8.bin
98c26d5c6d216ba6cffe13da1aa67b4e45e30f42da5d7d3b018a1601160c4024		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 12000 bytes
font_02_sfnt_off00013657.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13657 4324 bytes

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