Malicious PDF — malware analysis report

Static analysis result for SHA-256 311a85c957197d1c…

MALICIOUS

PDF

68.5 KB Created: 2021-02-10 13:29:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: b443f3bc7f6bd21910b8ef7b3ba2bcb8 SHA-1: 89adaa97c323e302805033e42124fbf427527a74 SHA-256: 311a85c957197d1cb012dbace85ea0f7031ce124f93a2d6adc141dcc1fb0179d
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=el+rancho+ad+austin In PDF document text
    • https://tosafesixagosug.weebly.com/uploads/1/3/1/3/131383933/5557017.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/iigifQv/starting_your_own_kingdom_bannerlord_2.pdfIn PDF document text
    • https://jafiwivejo.weebly.com/uploads/1/3/5/3/135305612/5091165.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/eoCOghE/voxaz.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/4544cce57.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/hfhajdL/dwayne_johnson_hd_wallpapers_for_iphone.pdfIn PDF document text
    • https://voxujoponita.weebly.com/uploads/1/3/1/6/131607404/7b306ced6ca0c.pdfIn PDF document text
    • http://ijmalan.xyz/tum_hi_ho_mp3_song_download_in_tamilgtxev.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/owgehcT/the_hangover_2_end_credit_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/lisutovudaf/gif9hiN/fimatevawinimusuxaminijo.pdfIn PDF document text
    • http://serdyukov.pro/kekoxuwqzg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457620/normal_6014a11dd0eff.pdfIn PDF document text
    • http://legionmone.xyz/bon_voyage_french_1_textbook_answerswh71f.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/agSEjgA/parlour_x_reader_lemon_forced.pdfIn PDF document text
    • http://123dutch.com/jubonubifao66sb.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_off0000cdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBD 4984 bytes
SHA-256: 7b1ad1a4cee8491ff09ec4202827ec36ca981fd6ac6bd4aa0f3e12b33a957b40
font_01_sfnt_off0000dea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 11052 bytes
SHA-256: 4b1cd8cad0acc791e827b80c823b9ae93ac8c2e3a1570e101a60bd390de14e84

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