Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1858d550d1a5426…

MALICIOUS

PDF

81.0 KB Created: 2021-05-03 01:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b3f8af65e527ec5e561e4446c767582e SHA-1: da39950e287e44b64a8e454ebd8e493536fd04cc SHA-256: b1858d550d1a54262b0bc9aecae8bf589415cdc2381218cd083c96343e24600f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=how+to+replace+a+carburetor+on+a+poulan+pro+chainsaw PDF link annotation
    • http://kutivefivugokev.mypressonline.com/wordly_wise_book_6_lesson_11.pdfIn PDF document text
    • http://misujupino.getenjoyment.net/gititeliliboxunulanaj.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/geo8geb/n64_emulator_download_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/zibepidok/jeDfgcV/58255271531.pdfIn PDF document text
    • http://sumigemag.mywebcommunity.org/definition_of_development_communication.pdfIn PDF document text
    • http://kulufoxeru.22web.org/91177437094.pdfIn PDF document text
    • https://cdn.sqhk.co/dovumisiwe/P8gjjgc/cumulative_distribution_function_notes.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/zixebuzikunisebo.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/rjebTih/70275886111.pdfIn PDF document text
    • http://debopuforu.22web.org/56211854109.pdfIn PDF document text
    • http://mewanomape.iblogger.org/how_to_change_transparent_background_to_white_photoshop.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://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_d89ecab2089f4925a2e0ebc737dcbaaf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/638f442f-4ae0-4d5d-8ec0-a49613984b0f/68220204979.pdfIn PDF document text
    • https://7ce190f9-fb8d-496c-a51a-ce151dcc024a.filesusr.com/ugd/e72def_fbb1f98aaa0641aa999191572604afce.pdf?index=trueIn PDF document text
    • http://lorasis.epizy.com/kgf_chapter_2_songs_tamil.pdfIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_19d9704ce0fa4f5d92197e120035c906.pdf?index=trueIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/55575153921.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84594dc7-a47e-46d0-809b-0b9dcef6531f/53941588755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37eb82c1-899b-4d91-810e-24ea4f8aca94/tebiziwuzajupew.pdfIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_afedd1c1ab464391af18c6389751539f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6dad27-b5cd-4f31-8d67-973d195e66ea/15379734167.pdfIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_097d98f2910e409e87ec57292c2373f6.pdf?index=trueIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_16eab0917b9248b49ed6d93e6bf9937f.pdf?index=trueIn PDF document text
    • http://fifoxov.rf.gd/basic_computer_knowledge_in_gujarati.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_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 5096 bytes
SHA-256: 561b7a6ce7953c75f6d5a3781d6d2f91d72a547f0ddeab5cc648981b3a931b60
font_01_sfnt_off00010422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10422 10436 bytes
SHA-256: db63a6a40c5750d90516859ffdce114717ae16ca3a55fd2e9df6420028df49a8
font_02_sfnt_off000127b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c