Malicious PDF — malware analysis report

Static analysis result for SHA-256 bebda6b2c04ff15c…

MALICIOUS

PDF

75.9 KB Created: 2021-05-17 00:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 230d0f582d6ff75e0deb5d2cc27ab102 SHA-1: 53cee7b73f3d60ebd6a7cd3a1b94506baaf2844b SHA-256: bebda6b2c04ff15c6f407e93b28a4a720420af356bc44fa861c76c87f0563bf8
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high volume of links on low-reputation hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the heuristics strongly suggest an attempt to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/strik?utm_term=the+external+auditors+might+consider+the+procedures+performed+by+the+internal+auditors+because
    • http://digosige.mywebcommunity.org/dapepakebekigogi.pdf
    • http://1offpark.xyz/32766604209lbft8.pdf
    • http://vevaxogejaz.scienceontheweb.net/livro_manual_de_anlise_de_dados.pdf
    • http://jalosus.mygamesonline.org/dibinugepekurosifofajowup.pdf
    • http://xunarepozufuz.mygamesonline.org/suzuki_access_125_specifications.pdf
    • http://remastacer.com/abstract_class_and_interface_in_java_with_exampleio2ab.pdf
    • http://sutiboju.sportsontheweb.net/convert_to_dwg_autocad_lt_2020.pdf
    • http://afracheat4.xyz/masitulujitawamud14r71.pdf
    • http://com-copyrighit.com/confluence_create_template_variablesgcngl.pdf
    • https://static.s123-cdn-static.com/uploads/4371495/normal_5fccb3b843399.pdf
    • http://umkatrade.ru/white_and_rodgers_thermostat_manual_1f80-361iw4o3.pdf
    • http://jixewelo.scienceontheweb.net/bemulixew.pdf
    • http://wijasagasipode.getenjoyment.net/joindre_plusieurs_fichiers_en_un_seul.pdf
    • http://stnold.com/gitulodirepazol244ch.pdf
    • http://reactivaperu-2020.com/how_to_replace_trane_fan_motorz1tm1.pdf
    • http://gejesixave.scienceontheweb.net/58359909522.pdf
    • https://cdn-cms.f-static.net/uploads/4445550/normal_6035b00bd557f.pdf
    • http://chambrehq.xyz/91990904781k1r33.pdf
    • http://nesorus.mywebcommunity.org/why_is_twilight_not_on_netflix_anymore.pdf
    • http://nesorus.mywebcommunity.org/tosafejarevozujalemobozob.pdf
    • http://sakivometo.medianewsonline.com/40072781422.pdf
    • http://zisapawiwako.mypressonline.com/derivatives_and_alternative_investments.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://romepasuv.myartsonline.com/graphene_uses.pdf
    • http://jojulupijawide.onlinewebshop.net/47662307439.pdf
    • http://supuwevul.atwebpages.com/wooden_boat_building_books.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e958.bin
c1503209f66d7b81e7f41d37b5f98665dd3dd88e3023aa003d8cdaa25d10f208		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 5828 bytes
font_01_sfnt_off0000fd10.bin
171f9b4bcd2cc726031b41a3fb6d848b193ab8b396fc967f9da3c32db0045017		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 10436 bytes

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