Malicious PDF — malware analysis report

Static analysis result for SHA-256 903238b0de225094…

MALICIOUS

PDF

79.4 KB Created: 2021-03-13 15:09:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 213879598d2f12d9865fda1237345f9b SHA-1: 15519d47041c2205d78375d11fef59eeab8743f4 SHA-256: 903238b0de225094c190456afa3c2a40548aba93d032effb446b2046c6795692
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/wix?keyword=anatomy+trains+book+pdf+free+download PDF link annotation
    • http://golobupovi.22web.org/kadasiluwo.pdfIn PDF document text
    • http://itsnat.space/action_movies_2017_english9ba2z.pdfIn PDF document text
    • http://hightrade.club/mrunal_geography_notes_in_hindi6m1bd.pdfIn PDF document text
    • http://kexejadupuna.66ghz.com/florida_state_map_template.pdfIn PDF document text
    • http://busivel.xyz/tegudilubowatimixxvtu.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://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_0825a05ced50491c9f69d25edb5a8489.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d7be29d-fd61-4bcf-be48-512179dc59a3/95732755855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ed26bbd-5696-4656-91e9-9f72acee4a86/kadevikagezusivitekonub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f16627-8ded-4c96-90d5-8f9b0f65c13f/lewobiruf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44ef732a-65ec-4d48-9120-219e97826e36/problematicas_actuales_en_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/performance_appraisal_interview_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d80acc24-dd42-4cb6-9286-cf16374143f1/arduino_1_digit_7_segment_display_code.pdfIn PDF document text
    • http://ruduwemuzivikis.epizy.com/what_duracell_battery_replaces_lr41.pdfIn PDF document text
    • http://lifapalifarivug.rf.gd/what_is_an_offer_in_terms_of_contract_law.pdfIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_fac44565ee5e4838a710fd24a6b0c3e1.pdf?index=trueIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_fb2572c81a784f0a8401adb69e3cd2d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sorogamat/26355638704.pdfIn PDF document text
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_c43666e068ad45c3b1a67feeb67f921e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c603ce3e-38d6-4096-8be9-76cb5f4c79ea/dabubujebegaxosexoburofu.pdfIn PDF document text
    • http://soneloratugop.epizy.com/teaching_reading_approaches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2414a8ea-fad2-4622-b636-1f9c5c8bc271/romeo_and_juliet_act_1_scene_1_study_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/jusuludip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca0b7ccd-a972-44a8-97aa-1dc45614aee5/delta_miter_saw_dust_bag.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_5c685ac340394dbd996b1b7e6a837720.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_off0000ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 5364 bytes
SHA-256: 4207d085d0afeca3f9213d3b8aca2d44c28bbd9804c47c56a27eebfc75bb9245
font_01_sfnt_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 10944 bytes
SHA-256: dbd1b960044dcf343ccf10518b48c63a63bd7100e3c0ed3bd15ed9aa605c5495
font_02_sfnt_off00012201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12201 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3