Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba31ea3dc4661bde…

MALICIOUS

PDF

84.4 KB Created: 2021-03-15 03:09:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ece303d0eb30cdbebaf9e351ea49580c SHA-1: 826677078248a8ccaed3a196f24034985654d395 SHA-256: ba31ea3dc4661bde81b0819a549337295a9ba1f7b5f5a39a7c8b774bd2e4b236
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://botokaw.ru/123?utm_term=compliance+assessment+report+sample PDF link annotation
    • https://cdn.sqhk.co/vefapatape/aRfZ8je/apple_music_student_subscription_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidimewako/giBidjg/xojelipururivozazowoliv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454811/normal_600b606bb84a1.pdfIn PDF document text
    • https://cdn.sqhk.co/mejofiwog/idBOiiY/dunuratulakin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5fd81e915c097.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_88d03e8917924c69aac05d1b53b97912.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/leave_of_absence_from_work_template.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_8e9cf2efa5c042248797e1d4cc57ddb2.pdf?index=trueIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_5042aee3efbf45a1af5fd73ed4f78ccf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/116cff50-c1d3-4d91-af3f-62bd104f2327/52368021706.pdfIn PDF document text
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_a7b69838a73c4439a86e93273b45cc3d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ditiruz/mudenafoni.pdfIn PDF document text
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_08f8b707415545e0806df2f6c68c232c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43ea0fb-3eff-47c8-a114-81d3659b3ae5/jorax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceeb7e26-14e9-4d2f-951f-d3ff071b1ad3/speech_and_debate_full_play.pdfIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_789c35eac0c64a42bb5e39e2b5f39a60.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4279d1c1-18d9-49ec-b06a-3cea2a33e030/71046450014.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/beviwolulilakunubepotogi.pdfIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_0bf68e689bcc4b3cb84e5999c06dd27c.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_off00010f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F26 4984 bytes
SHA-256: 2dbe212f46cf3c9ab0808993425e42d69bcb7dee0e04739fd101ee096f10c965
font_01_sfnt_off00011ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFA 10868 bytes
SHA-256: 4d20f7e1ab0efb659fa1f0c821c5c4155da57305009d6ffcb98cd1b0ed96b501