Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46f4b7055bae95a…

MALICIOUS

PDF

86.3 KB Created: 2021-02-24 18:25:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e2d6454c2ea1c71debcbacdddcaff782 SHA-1: 25db1f6f9520d2cae343b3ba7c3adb1ef51401e8 SHA-256: b46f4b7055bae95a050928c239caf2011a313bb143850e062983cf9b27cbf3bd
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links pointing to potentially malicious or disposable domains, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, appears to contain keywords related to search queries, suggesting a phishing or redirection attempt.

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
  • 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://yafferge.ru/strik?utm_term=for+the+first+time+in+forever+piano+sheet+music+pdf In PDF document text
    • http://vijexibat.mywebcommunity.org/how_to_propose_a_case_study.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417670/normal_5fced2e2f00cc.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/can_a_cracked_heat_exchanger_be_dangerous.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/89674724068.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/50077564430.pdfIn PDF document text
    • http://fexekozupupuge.22web.org/69471819226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416495/normal_600eae6481060.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/87662354558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388613/normal_5fe6f9f2de0a4.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/hsA2yhg/15851697982.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nununad.myartsonline.com/36347856363.pdfIn PDF document text
    • http://fukasutatota.rf.gd/coliform_spp_infection.pdfIn PDF document text
    • http://radalimufan.rf.gd/bubble_shooter_3_game_uptodown.pdfIn PDF document text
    • http://supuwevul.atwebpages.com/garmin_echomap_plus_94sv_livescope_bundle.pdfIn PDF document text
    • http://gogobat.epizy.com/totevijubebonezosonukelos.pdfIn PDF document text
    • http://mibesajaku.epizy.com/netflix_for_sinotec_smart_tv.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 5380 bytes
SHA-256: 092a8fa11f44acf56f0412b4ae12b55301dccba27853e60c89c8dcc59be63258
font_01_sfnt_off0001116b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116B 10792 bytes
SHA-256: 843ad342202b41748aa0c4cf490a01f4542d89ff4dd27c805a48ff99be6b26be
font_02_sfnt_off0001363b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363B 16100 bytes
SHA-256: b330339415d7fa9c1b652c1fb2a052ec06569061b7b71506ab53161dc9b94742

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