Malicious PDF — malware analysis report

Static analysis result for SHA-256 9126120f658ac1e3…

MALICIOUS

PDF

84.0 KB Created: 2021-04-06 17:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 897df992b8c3b62f6cda0bb5a674018d SHA-1: e46f626f1c36b65cbd344681277edb31b965d2e9 SHA-256: 9126120f658ac1e338cc0c193adc60ab35544e07fdce9655170df49aed64dd43
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URLs and the PDF structure itself are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=brain+break+cards+pdf PDF link annotation
    • https://nagugopusoz.weebly.com/uploads/1/3/4/6/134645600/xolelofene.pdfIn PDF document text
    • https://cdn.sqhk.co/lunexubafexo/jdDDjb7/green_bubble_menu_walnut_creek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384819/normal_6037276d23aef.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/N70hbI2/kizabedojarozuzo.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/BhdsMX0/98160641229.pdfIn PDF document text
    • https://cdn.sqhk.co/wirubetena/Ajhfjab/zenosi.pdfIn PDF document text
    • https://navubenawegef.weebly.com/uploads/1/3/4/3/134320789/digufidi_tozugad_jidimona_bikugigimod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_602451c9a836f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468871/normal_5fcc5f591f946.pdfIn PDF document text
    • https://vuzupugum.weebly.com/uploads/1/3/1/4/131453250/6678603.pdfIn PDF document text
    • https://cdn.sqhk.co/diwiporeb/XgjNJgc/dark_forest_iphone_wallpaper_hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388276/normal_6056024b5ec3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://66f9544f-8325-470d-a543-c07714603334.filesusr.com/ugd/4b2642_1f75c5436332444792c9cb3e36e0c88d.pdf?index=trueIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_fcacf82174eb40068c4afa0bc3102e18.pdf?index=trueIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_781ce6c528ce44c8835942a14d17144b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupebesu/modos_de_produccion_esclavista.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/what_s_on_tonight_brisbane_tv_guide.pdfIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_1f80ccbf149e422d90b3ce3d14e5df1a.pdf?index=trueIn PDF document text
    • https://19004eff-8f5e-45b0-b15a-9fbdbd99e39d.filesusr.com/ugd/578ea4_bd3a633240fa4bcc881d2a59b9a8f292.pdf?index=trueIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_99d9b6bdd0394b83a846d0afa7e80b8f.pdf?index=trueIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_288f6ed0a34d41feba8f2c03357aafe7.pdf?index=trueIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_fd936cdf7f384f5db5cd41d50f96d9b5.pdf?index=trueIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_cc880de36bf64ca0b993a72612ee9edb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 4968 bytes
SHA-256: 31b14934413d64da589f81b7ba1aaf38e9e61c2ae375f284673671de9e1faadb
font_01_sfnt_off00010ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 10984 bytes
SHA-256: e255d286eef196703a5cacbd201f7915b5d7f2b7d1f3cdd55067a199677a79b4
font_02_sfnt_off00013452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13452 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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