Malicious PDF — malware analysis report

Static analysis result for SHA-256 b527469077af9c4e…

MALICIOUS

PDF

75.3 KB Created: 2021-05-05 05:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fe36a15573a7f9fb044f76b9e1bd602c SHA-1: 892f77566ce6653b67fd0774ed87f2644e0ff625 SHA-256: b527469077af9c4e9bbb1b65614ca48e0ab7f5a63ca7469e295ce4488d00f8e4
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, appears to contain search terms related to network device management, suggesting a lure to trick users into clicking the malicious link.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+restart+cisco+router+from+command+line In PDF document text
    • https://cdn-cms.f-static.net/uploads/4449771/normal_60552dee9a8f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500669/normal_60328364bc409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414487/normal_602eb1ed8ec3d.pdfIn PDF document text
    • http://cashbackk.site/empire_builder_amtrak_route_guidezevwg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481422/normal_605dde93d5ce6.pdfIn PDF document text
    • http://xsafak.com/xawefigar3c0wi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_6023fd0c22110.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407724/normal_5fcf588b2931b.pdfIn PDF document text
    • http://gebigulexejo.sportsontheweb.net/space_odyssey_book.pdfIn PDF document text
    • http://farozemirig.scienceontheweb.net/fudukeroniguz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454425/normal_605c2210a1d36.pdfIn PDF document text
    • http://hempmap.ru/musisisizujajajorazaxi1uhc3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://legatuwaw.epizy.com/how_many_calories_in_a_large_dunkin_donuts_black_coffee.pdfIn PDF document text
    • http://dalonirutufitad.rf.gd/50283370408.pdfIn PDF document text
    • http://zefinut.rf.gd/how_do_you_describe_the_climate_of_an_organization_address.pdfIn PDF document text
    • http://lolurisufetofel.epizy.com/african_hip_hop_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/vat_amnesty_scheme_form.pdfIn PDF document text
    • http://lojuwuwa.rf.gd/super_mecha_champions_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/dmlt_biochemistry_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/jowegitonunakax.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_off0000e6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 5220 bytes
SHA-256: d2a08a22354673c39be230bd90e208615134e932160b5c4229c8c1dcf6d6ee21
font_01_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 11516 bytes
SHA-256: 4bfeaad8b858e3b35479080fd8955eb7620d86ee36135526049a135c9c18457f

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