Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9b19e8c70ef85d…

MALICIOUS

PDF

77.2 KB Created: 2021-03-11 19:25:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 13b9c36dd851feb436703e3fe0234ea7 SHA-1: 03a69809b8a1f545384804809f5203cab3ae02d1 SHA-256: cf9b19e8c70ef85dcb871e9c73a6ba5c3d293ca2b4708f24a2ddd0e525fd0bdc
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. The embedded URLs are likely used to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=guidelines+treatment+of+pneumonia PDF link annotation
    • http://bebetadiruj.mywebcommunity.org/consejo_de_participacion_social_seph.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383340/normal_5fdce670f0a2f.pdfIn PDF document text
    • https://cdn.sqhk.co/nezupusovefi/heicvKh/aararum_kanathe_aromal_thaimulla_song.pdfIn PDF document text
    • https://cdn.sqhk.co/dedikunakudu/hiieI0R/78352572209.pdfIn PDF document text
    • http://wupemokabate.scienceontheweb.net/kufifuzatafisij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_6017d3e45b625.pdfIn PDF document text
    • http://zobabikox.medianewsonline.com/dragon_age_origins_nightmare_mage_build.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461232/normal_603d6e9a3433c.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/hdCjaqs/91021601472.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484143/normal_5fcaef33b0249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387224/normal_602b35cc56f8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426682/normal_5fc949882c918.pdfIn PDF document text
    • https://cdn.sqhk.co/zefafulolit/gfLTCO7/wulofivojazon.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/what_does_cutting_apple_mean_in_a_dream.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/jcJggjv/wikipedia_donation_2020_is_it_real.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitasixan.atwebpages.com/how_to_do_ratio_to_fraction.pdfIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_5af857ee16f34035899abd73f3227896.pdf?index=trueIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/microsoft_office_2007_windows_10_free_download_full_version.pdfIn PDF document text
    • http://fusozevukatamir.atwebpages.com/81595356763.pdfIn PDF document text
    • http://vesedakowata.onlinewebshop.net/68239252432.pdfIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_b2b1f730134045d0bb7911367dba7afb.pdf?index=trueIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_c359cfe99198446fbeab94e37fbfb49d.pdf?index=trueIn 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_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 5220 bytes
SHA-256: b3d8331f7be4c7db63b1853a14f9173f6fe6f95324870581036917df3b319082
font_01_sfnt_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 10420 bytes
SHA-256: 54e86c99d461f8960bb6e2ca073b5fb920e4d4d8fd81e5188f846c68aa0630ea

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