Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb519b2274cddd34…

MALICIOUS

PDF

73.9 KB Created: 2021-03-13 17:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 90fff49ffc9658585e916821126089d4 SHA-1: 23c30fcfce9b6ae54d400cfc9d7e2dca212d9a5f SHA-256: fb519b2274cddd3423eb57d63026f1b73df80e6f617cdf3bf4f767f3f25dcd19
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to 30 external PDF files, suggesting a link-farming or redirection scheme. ClamAV detection and ML classification strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded URL 'https://xajibur.ru/award?keyword=personification+worksheet+with+answers+pdf' likely serves as a lure or a redirect to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://xajibur.ru/award?keyword=personification+worksheet+with+answers+pdf PDF link annotation
    • https://vojonabof.weebly.com/uploads/1/3/1/3/131383251/bozojaru_pazonebipodora_motovaxonew.pdfIn PDF document text
    • https://zasawebisev.weebly.com/uploads/1/3/4/8/134865024/dovenuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403565/normal_5ff6ae49b37fd.pdfIn PDF document text
    • https://nojamatisi.weebly.com/uploads/1/3/1/3/131384142/romofuferev_fonulirobuxo_sixajuvogiro.pdfIn PDF document text
    • https://xojakonokixamu.weebly.com/uploads/1/3/1/1/131164577/83e43eb0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_60198c5f9aa59.pdfIn PDF document text
    • https://putonikasobex.weebly.com/uploads/1/3/1/0/131070178/jejedes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459621/normal_600dc215a40e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/muwifetavupese.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/maximum_principal_stress_criterion.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/rofirojizi.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/32481165546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/306a73f8-9479-4f79-9fb4-808f5c140e23/debajore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f885104-db78-4cb9-9f4e-f49bf8b1a05d/gnostic_gospel_of_judas.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/40134248021.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/kodolosabevedobuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0303df98-fb9c-4397-b698-1017e0b07024/whirlpool_washer_error_code_f6_e2.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/rilepukekamurafo.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/angry_birds_rio_game_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/scared_to_be_lonely_audio_song.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/13188410967.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/33992056247.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/xepatilisudimisi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 5368 bytes
SHA-256: fd9b90ed619d1670444f23daa4c1ecb9403238f61a86a4ff194d714010ea5c82
font_01_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 10532 bytes
SHA-256: 552345b031dbb42a84bf771baa15bf0b68e49c4e9170e776fe37183826309186

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