Malicious PDF — malware analysis report

Static analysis result for SHA-256 255287e1a9f16b72…

MALICIOUS

PDF

144.4 KB Created: 2021-03-15 21:58:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dca39d513b4ab99d3120fec1be9edf45 SHA-1: 278aca1f9e354086dd3c5b63ccc5f89c2c633920 SHA-256: 255287e1a9f16b72930e1a91593ef7be7f1d491ba3d686a4807194ea136cbf57
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, many of which are designed to mimic legitimate file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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://midufefew.ru/award?keyword=agrarian+reform+act+pdf PDF link annotation
    • http://13millions-warzone.store/help_annie_endingyxx3v.pdfIn PDF document text
    • http://hookup153.site/what_is_the_meaning_of_the_name_sisyphuswry0v.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/jbGieo8/shape_monster_craft_template.pdfIn PDF document text
    • http://peuly.xyz/kaba_5000_code_changekhgap.pdfIn PDF document text
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/jezubijavifunopebabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_5fe9758476c59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499309/normal_603b2dc339ee9.pdfIn PDF document text
    • http://startbastar.online/which_star_is_hotter_and_many_times_brighter_than_the_suns0slm.pdfIn PDF document text
    • http://digtalcaliper09.xyz/how_to_use_the_hoover_max_extract_carpet_cleanerbhw5s.pdfIn PDF document text
    • http://ruszaimclub.ru/sufefejonofighb.pdfIn PDF document text
    • http://prod-fruit.space/what_is_the_efficiency_of_a_heat_exchangerjo5bx.pdfIn PDF document text
    • https://tadizusojad.weebly.com/uploads/1/3/2/7/132712436/wupuwaguz.pdfIn PDF document text
    • http://it50life.pro/1263025173mvclh.pdfIn PDF document text
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/gerememu.pdfIn PDF document text
    • https://romuxejis.weebly.com/uploads/1/3/4/8/134887308/jewujar.pdfIn PDF document text
    • https://cdn.sqhk.co/fasixazijaz/Jhd1jaP/rimafijamor.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/figofezedexefekalin.pdfIn PDF document text
    • https://jimiwijir.weebly.com/uploads/1/3/4/5/134525211/deweza.pdfIn PDF document text
    • http://fastpysystem.online/shimano_claris_r2000_specsrhpbx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459329/normal_60317895537b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC1E 5256 bytes
SHA-256: 9f0076e63ff34ee1e8d6fb5ec88d4f7160274f2dfbc87d1d993b97079e0ee229
font_01_sfnt_off00020df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20DF1 10936 bytes
SHA-256: 3fbc5116c5add9a51dbad3863557e80f1b42d4587a1a482e9d8bd06ff6a16a7e

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