Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa51861877f31fb4…

MALICIOUS

PDF

73.4 KB Created: 2020-12-01 09:59:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a0a5eef8c6339b0df1327ad6f890a624 SHA-1: 9d3d36dc147862cfa5b00f24a9d3b3d99be8510e SHA-256: aa51861877f31fb46e5d0b709de0b2e6d9a36393dde179de96fe29597af2d46f
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 0.9997

Heuristics 5

  • 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.
  • 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://traffking.ru/strik?utm_term=black+butterfly+book+1+pdf PDF link annotation
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/167060.pdfIn PDF document text
    • https://wixurawitubeza.weebly.com/uploads/1/3/4/3/134319602/jixenuvuvomotix-lamen-liwilileji-zewesu.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://s3.amazonaws.com/rowubunak/83508621216.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/xunaj.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/last_christmas_piano_sheet_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4a3cf8cdb769c6d8dbb1/1606371901938/jabon_de_azufre_para_el_pelo_graso.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/60349390389.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/goforumewoteboruromifovo.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/spotify_premium_gratis_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/deadpool_2_take_on_me_song.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/simuwuleful.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/27516743648.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/86117064149.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_off0000d333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD333 5108 bytes
SHA-256: a4f675fce8ab91daf30fbcd0681d32b343535a0a723f80af9e4c96a6e54f1741
font_01_sfnt_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 11292 bytes
SHA-256: 467190a11068fbfaf9faec5424de8e07701b8260e2c2222ee47756e4b84986d0
font_02_sfnt_off00010ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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