Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4108d13ce9bf25…

MALICIOUS

PDF

76.2 KB Created: 2021-04-03 10:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ece1a97956c0257d7c24b19feea058f SHA-1: 7490f24ad4d4552225669e1c7d72e47822f09d9a SHA-256: 9f4108d13ce9bf2581455f2b1021523544d9f902770c5c4c7b816a049c23c960
96 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, one of which is directly referenced by a heuristic as an external URI. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing purposes. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external URIs suggests redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://botokaw.ru/123?utm_term=internship+report+format+for+mba+hrm
    • http://erogan-encolumbia.site/wofedudunuriwuwowuraxegugaic9g.pdf
    • http://lenudes.com/grief_and_sorrow_piano_sheetmzbe9.pdf
    • http://site-shop.xyz/f_a_d_ki_full_formpobjq.pdf
    • http://obuv-kozha.ru/tixagavaxiql354.pdf
    • http://glawerry.online/p_a_full_form_in_english2xg8r.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/veraxawewib/kuboxaxen.pdf
    • https://4e16d9da-0927-4957-8a4e-4544605d6055.filesusr.com/ugd/d7e550_c884ad4d14eb42ccad298cedfc8af86a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ea8171cd-955d-4f4f-9b09-ae9731da95cc/how_to_make_anyone_like_you_leil_lowndes.pdf
    • https://s3.amazonaws.com/belopudevuzuza/livingston_county_il_police_reports.pdf
    • https://uploads.strikinglycdn.com/files/c6ae5a2e-955a-4250-b4d2-d8668ff40639/gregor_the_overlander_series_suzanne_collins.pdf
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_cd3f11054fb441c98df9a068a4ee32da.pdf?index=true
    • https://s3.amazonaws.com/nasitevu/91264486709.pdf
    • https://s3.amazonaws.com/mipizaju/gagabufaluribaku.pdf
    • https://uploads.strikinglycdn.com/files/486e8cf3-c227-4471-8068-d5e5b5ac62b7/direjebebarorobujafubesog.pdf
    • https://uploads.strikinglycdn.com/files/2e67d9a5-50ae-4419-b4b5-608c1c69e431/how_did_world_war_1_affect_the_environment.pdf
    • https://uploads.strikinglycdn.com/files/2ebfb73a-6f49-4352-b89e-e0ce6828611e/91840678246.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef6f.bin
425c5e141fbf51409145ac7f7a024ad2aa9ad09c5a867b91631f24254afabdef
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 5188 bytes
font_01_sfnt_off000100e4.bin
b840f3f1da2c9746fef3a779d46c6f6f03c73737e83885bff220e8a4892ebb32
pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 10300 bytes