Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b58a119d4c7fb3…

MALICIOUS

PDF

74.2 KB Created: 2021-03-14 14:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5dfa7f9692d3d91aa54f58401d8ffb9c SHA-1: 8b46be55fd7cd7a49c9bbe64ea692772bf9cc931 SHA-256: c9b58a119d4c7fb30dca1ba22b1d3bf558754789f2207fb1a56f8b9a317c2363
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links. One prominent URL, 'https://soxebez.ru/award?keyword=definition+of+labour+economics+pdf', is directly embedded and likely serves as a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://soxebez.ru/award?keyword=definition+of+labour+economics+pdf PDF link annotation
    • http://thrivewebs.com/what_is_food_grade_hydrogen_peroxide_35bl104.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/cual_es_la_importancia_de_las_reacciones_de_combustion_en_la_vida_cotidiana5khps.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/xasovewipeje/mass_communication_living_in_a_media_world_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/pulodud.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/moxowaludoraxo.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/language_barriers_in_the_workplace.pdfIn PDF document text
    • http://tononade.rf.gd/misegefedixapamowejubano.pdfIn PDF document text
    • https://5a11eff3-0c7a-45dd-bb89-060d4d4d2060.filesusr.com/ugd/72216b_28f71cf3e60546c6a73a0a3785e15ca7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30ba8477-19bc-44df-94af-bc13102d3b35/google_earth_pro_download_for_mac.pdfIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_7ff3258fb97f4330925c4f6b552d9d5a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zalomi/wanegawituzuripopi.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_0b12a06616d54c739bca7598f5abe2e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace968e7-139a-4a1c-8288-040a296f53c6/80368436497.pdfIn PDF document text
    • http://luxopemuvoxu.rf.gd/honda_gx390_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/the_hobbit_3_free_download_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d1db5e-e1cc-4e05-be36-cfb6f16f986c/49666728322.pdfIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_b7d492e9970d4fac82ddcc97263b3b34.pdf?index=trueIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_0211642b06d243509c7777809be412e9.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F4 5440 bytes
SHA-256: b214db9e8cc859566664ca485002f8d6a5e320cd00312971d0df0cda610574ef
font_01_sfnt_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 11552 bytes
SHA-256: 0916f452e56080bfed425fc6ae8c706f9a61024cf4c5459bf99ccfee2b4a151e

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