Malicious PDF — malware analysis report

Static analysis result for SHA-256 c604642552bfe946…

MALICIOUS

PDF

79.4 KB Created: 2021-04-08 00:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f4fcc9a20145b8150e7bb40db9ac7e80 SHA-1: 41c9a432a2c0aef890dbd5bc25eae35a5173a699 SHA-256: c604642552bfe946e8726396d0e3e60e8bb9db229dd9da628b7418d57e97256f
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and embedded URLs suggest a phishing or scam attempt, likely using a link farm to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • 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/wix?keyword=sine+and+cosine+graphs+worksheet+answers In PDF document text
    • http://womovenum.sportsontheweb.net/48835317425.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/Vhhyhfx/vitamin_c_serum_benefits_in_malayalam.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/zoe_happy_fit_fitness_guide.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/1217151907.pdfIn PDF document text
    • https://cdn.sqhk.co/felegabiw/hagije7/10348451003.pdfIn PDF document text
    • http://ninijefaligogi.mygamesonline.org/83451234010.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413017/normal_5fde6c2737745.pdfIn PDF document text
    • http://muzomabavima.medianewsonline.com/difference_between_autecology_and_synecology.pdfIn PDF document text
    • http://neridofufuleteg.scienceontheweb.net/juwalozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489404/normal_6011197857b77.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/qhgjbhk/zinipirefugonotajolakuwu.pdfIn PDF document text
    • http://fibaxoxadomi.sportsontheweb.net/64809965234.pdfIn PDF document text
    • https://cdn.sqhk.co/nujekezitifi/QHgvpgd/84646339006.pdfIn PDF document text
    • http://noxetoporobosek.sportsontheweb.net/equilibrio_acido_base_fisiologia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409417/normal_602b9dcc5c3c9.pdfIn PDF document text
    • http://lotukaguw.sportsontheweb.net/83424836376.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483346/normal_5fca837d62db6.pdfIn PDF document text
    • http://zaxiluxedexu.getenjoyment.net/muxomifa.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/tefalovujuzex.pdfIn PDF document text
    • http://wivupivipewezap.mygamesonline.org/cattell_horn_carroll_theory_of_intelligence.pdfIn PDF document text
    • http://zovofuti.mygamesonline.org/81822748162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387817/normal_6039743199476.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jatugeset.atwebpages.com/47531719065.pdfIn PDF document text
    • http://fotizojorirepel.onlinewebshop.net/jurassic_park_theme_song_piano_sheet_music.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/sri_venkateswara_govinda_namalu_in_telugu_mp3_free_download.pdfIn PDF document text
    • http://vafitinupisojud.onlinewebshop.net/46132872301.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 5352 bytes
SHA-256: a44474449a48584061490c9a819b0d8840178f81920f063ec94bf58aaa1f25f1
font_01_sfnt_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 10692 bytes
SHA-256: e86048ce30619856ecfa63105287e104898354e668d0a337e150cb27c0c13033
font_02_sfnt_off00012179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12179 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333