Malicious PDF — malware analysis report

Static analysis result for SHA-256 9423fd5a052aad9e…

MALICIOUS

PDF

82.8 KB Created: 2021-03-12 20:24:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bffcad5bba5165417dfb804ac78b4664 SHA-1: a424cb1eaa74c559f685b62bceb259e2cbe8bf38 SHA-256: 9423fd5a052aad9ed100e941c74dc87e734d6064a96a15a2854df199ccdab99d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a tactic to obscure the true malicious intent by using a large number of links on various domains. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's designed to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/award?keyword=presentation+templates+pdf PDF link annotation
    • http://pasikufopubiwo.mypressonline.com/53060949326.pdfIn PDF document text
    • http://meetsalle.xyz/what_is_home_sleep_apnea_testx4ver.pdfIn PDF document text
    • http://zumanidoxup.medianewsonline.com/biguzinifawalokiwex.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/75036571056.pdfIn PDF document text
    • http://help-bluebadgecenter.com/pretty_little_liars_season_3_episode_24_recap399vx.pdfIn PDF document text
    • http://sekelenogake.getenjoyment.net/what_is_marxist_criticism.pdfIn PDF document text
    • http://kekewawoxugar.sportsontheweb.net/xopajenorovevisutin.pdfIn PDF document text
    • http://gachihyper.xyz/nuvi_2597_memory_cardwlsg6.pdfIn PDF document text
    • http://lianhua.life/fallout_new_vegas_best_companion5ya7l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445115/normal_5fe0a0f55fdc3.pdfIn PDF document text
    • http://converstarget.ru/tobowanepr7i7j.pdfIn PDF document text
    • http://kepuxom.mypressonline.com/how_to_use_classdojo_app_for_parents.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/what_are_the_traditional_musical_instruments_of_singapore.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416928/normal_5feb966dee7f8.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://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_78e7bc85558b454291831e8cd3e03228.pdf?index=trueIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_a12c3aa8b0b748f980e72f73dd5e0a88.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f74f27b-ecd3-4450-a73a-e7d2802316fc/19617602888.pdfIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_246ce6ed9ed54f999ae13b7bcde72230.pdf?index=trueIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_76d739d2c4054d43acb523b6f653b44c.pdf?index=trueIn PDF document text
    • http://mifedisiso.atwebpages.com/nomobevomegilid.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_874b2855974143f69bc1cd01fcaa1184.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c91d2b1-9df4-4668-8ebe-7399ee347d02/jidamomorafakiwu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 4976 bytes
SHA-256: 3007e3621443254690bc7602a191feab554e4569aa9705c68811b94166272f2b
font_01_sfnt_off00010c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2D 10312 bytes
SHA-256: 7ffb4b173b106a184c88e333cc03b3c9d7574d5be1f1439b6fc5862aab801494
font_02_sfnt_off00012f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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