Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25a95006f74fbb3…

MALICIOUS

PDF

64.8 KB Created: 2020-11-13 03:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7f34173273aefb177f12b22686496d0e SHA-1: 58db02aba9d50d69d93e816072f86a5f79048964 SHA-256: a25a95006f74fbb33dd4e5a51a957fe0cbc7621e13d34e0f8b6deee0934414c0
156 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 0.9998

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://trafffi.ru/aws?utm_term=helping+verbs+worksheet+with+answers+pdf PDF link annotation
    • https://xonujofepip.weebly.com/uploads/1/3/4/3/134385468/bomirorevibuzu-lezakinopop-xonodotudotu.pdfIn PDF document text
    • https://vikuregarune.weebly.com/uploads/1/3/4/5/134577585/xamiwarer-loxen.pdfIn PDF document text
    • https://refirumalot.weebly.com/uploads/1/3/4/6/134603215/virulilovalux.pdfIn PDF document text
    • https://zowerekogag.weebly.com/uploads/1/3/4/6/134672266/2987836.pdfIn PDF document text
    • https://fiwisiroveton.weebly.com/uploads/1/3/4/3/134339953/titikopevaze_kukusatudojiso_gopexovow.pdfIn PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/jufixobevexoji.pdfIn PDF document text
    • https://ritixalasan.weebly.com/uploads/1/3/4/2/134265532/8900014.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/a63fb.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/wenobagupexekap/just_busted_mugshots_knoxville_tn.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/nulewasawegatikinoleredo.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/duvomumoxovudutetupiwima.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/zimixojun.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/coleman_backpack_cooler.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/77863496704.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/definition_of_noun_phrase.pdfIn PDF document text
    • https://s3.amazonaws.com/tagorarib/bazurobobejibetigifubutes.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_off0000c155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC155 5620 bytes
SHA-256: c97eb41eee56fc6eab8a869ed4f7e1ae5b6f73f02e8f713a70449f6dc9d3d442
font_01_sfnt_off0000d47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47A 9968 bytes
SHA-256: 59069e9faba98e24ff1a520f7622885b717d74382b1189b8eee6c85c1175d544

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