Malicious PDF — malware analysis report

Static analysis result for SHA-256 828180549f55312b…

MALICIOUS

PDF

78.1 KB Created: 2021-02-01 21:01:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f8a77615925859e0ab08026d495aa37b SHA-1: 73c767fc65ed173143ed50b5a28819c3c62337df SHA-256: 828180549f55312b38ebe7b75ef0f5345674259fa7169481d8611c222728f723
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing sites, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or scam lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=the+art+and+science+of+culinary+preparation+pdf+download PDF link annotation
    • https://cdn.sqhk.co/rokabumake/hggfGeD/55958898789.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409244/normal_6006e5b278bdc.pdfIn PDF document text
    • https://memetunariva.weebly.com/uploads/1/3/1/4/131454345/1347130.pdfIn PDF document text
    • https://vexuzunudupugez.weebly.com/uploads/1/3/0/7/130740013/7d45067f8fc04c.pdfIn PDF document text
    • https://rawuwivusezorom.weebly.com/uploads/1/3/1/4/131406564/getubegozazu_busufamad_figusosu_wojak.pdfIn PDF document text
    • https://cdn.sqhk.co/sawapevodef/iQhcShU/ticket_to_ride_lyrics_meaning.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366360/normal_5ff64cc317e93.pdfIn PDF document text
    • https://cdn.sqhk.co/wobivada/higinM1/nfl_network_channel_spectrum_hawaii.pdfIn PDF document text
    • https://sugelama.weebly.com/uploads/1/3/4/8/134898925/benopifuranibof.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/fowonaxul/lupusregina_character_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/bsc_application_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/sawuvudawugo.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/public_finance_exam_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/18288911056.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/lekibusobetivowovajod.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/bumotux.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_off0000f3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A0 5384 bytes
SHA-256: 40091e5557bf994916d7c96d41574b7a941e770883c891054953f95564368925
font_01_sfnt_off00010603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 10752 bytes
SHA-256: 0925cc86ab9781cb80f779b66aad23d4ed68c6f58549c9922e635e6ef121e52b

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