Malicious PDF — malware analysis report

Static analysis result for SHA-256 afdc280e80758b0c…

MALICIOUS

PDF

133.5 KB Created: 2021-02-24 20:30:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d431c1236d01911ec0041c1774de803f SHA-1: 3ffa6be72da54fa6a897601a90b22b9e15f42143 SHA-256: afdc280e80758b0c3e7a07f4d8f6d2fedb9fb4153d5bc517fd5ce2957c8a52d9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to reference a news topic, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wix?keyword=cnn+10+october+15+2018 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403266/normal_5ffc39d548fa8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465938/normal_5ff65a8c50283.pdfIn PDF document text
    • http://steelsho1.club/ragazasusufoza6xfgk.pdfIn PDF document text
    • http://udilische.club/sawaxobanesikenapita3xno2.pdfIn PDF document text
    • http://slimitalia.space/keduwimifepabadafojyo59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_6013ba04e4e39.pdfIn PDF document text
    • http://mmuuue.space/secret_love_song_part_2_sheet_musicghkn7.pdfIn PDF document text
    • http://detonic-official.website/ionic_vs_covalent_bonds_worksheetmu9ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5fd1328cc5b6e.pdfIn PDF document text
    • https://wunawewob.weebly.com/uploads/1/3/0/7/130775592/e22cbf5d.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/what_is_the_best_way_to_store_iceberg_lettuce.pdfIn PDF document text
    • http://vsedlyatebya.xyz/easiest_way_to_learn_english_grammarnfoln.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xijisunuma.rf.gd/fejotomapi.pdfIn PDF document text
    • http://rogidisili.rf.gd/40656916043.pdfIn PDF document text
    • http://sokiguxesixup.epizy.com/ayyappan_swamy_song_tamil.pdfIn PDF document text
    • http://lisokabosexipep.epizy.com/45419031303.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_off0001cffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFFD 5060 bytes
SHA-256: d4f0b40eb2b6d4037460ba3756dbe5068fe2b19a2c9583bdf7cad9f18e3a7693
font_01_sfnt_off0001e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E151 11556 bytes
SHA-256: 487ecc92c03dd5b105aed6433edc52031a0bb671658c35fbfd216908a3ed5536

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