Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef82c3b8658487d5…

MALICIOUS

PDF

103.5 KB Created: 2021-03-17 06:29:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8aac6045975a3da1da56c7e9bd00cf27 SHA-1: d35580c8072761a71287b0a67710c19cacac0b2f SHA-256: ef82c3b8658487d5d515f7338c221d47bbdd26b399c0340bb01da9134f347126
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of a PDF link farm heuristic suggests the document's primary purpose is to redirect users to numerous external URLs, one of which is `https://kuzutuzo.ru/strik?utm_term=sepsis+as+principal+diagnosis+icd+10`. The document body contains garbled text and metadata, indicating it is not intended for direct user consumption but rather as a vehicle for these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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=sepsis+as+principal+diagnosis+icd+10 PDF link annotation
    • http://sonoxusa.iblogger.org/network_speed_apk_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393624/normal_5ffb64c58624d.pdfIn PDF document text
    • https://cdn.sqhk.co/xipapotug/gjidjfG/rotator_cuff_exercises_with_bands_handout.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451737/normal_6005d6d5db0ec.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/id7KTdE/farafavesos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_6036d253bec82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405674/normal_6003c9449b615.pdfIn PDF document text
    • https://cdn.sqhk.co/pibilebomek/AjfggEe/78627858191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497372/normal_60125016f1c64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445321/normal_5fffcce9cd53d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/3198458070.pdfIn PDF document text
    • http://dogurof.epizy.com/guide_to_installing_led_downlights.pdfIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_0bed1b108c004fba84ac102b7dda9c4a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/how_to_cut_stone_by_hand.pdfIn PDF document text
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_ab7a54403b7e4c54a322b5dd5f4d174e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gurafoga/vupakubugosafabog.pdfIn PDF document text
    • http://tumaxokalabad.epizy.com/naweregevamo.pdfIn PDF document text
    • http://vazalavowudepip.epizy.com/98411735616.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/bullets_of_justice_full_movie.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_ee870a50a7764033967c110d65fa945e.pdf?index=trueIn PDF document text
    • http://nalasorujuwasop.rf.gd/3_phase_power_supply_at_home.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/7452222841.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_off0001575a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1575A 5540 bytes
SHA-256: 485d931c4c82a8834b3db172a98bef6295dce35f90a156ac03aa74f119119b83
font_01_sfnt_off00016a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A3F 11128 bytes
SHA-256: 6457a6b597492ea2e1ddfa2e98c589fca13e99e4171457caa5f283c5f777a8e0

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