Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf7bbd5a3d74bdc…

MALICIOUS

PDF

82.2 KB Created: 2021-04-15 21:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 731e4eb3825f2ee2fcf585d52e482da5 SHA-1: 3c7b1fbe109f45d4cb53e151900b67a11c7cbfd8 SHA-256: baf7bbd5a3d74bdc8c8655b1048ff3ad20416269eca16be6e31f160fd7c57d99
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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://resalured.ru/strik?utm_term=inteligencia+emocional+libros+recomendados PDF link annotation
    • http://islta.fun/giwovopisub29fc0.pdfIn PDF document text
    • http://brosbass.com/wolfcamp_shale_formationttd32.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/jcsiiuu/29274674122.pdfIn PDF document text
    • http://shopbest.online/874969291130cg40.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/nrqhhe6/25654184948.pdfIn PDF document text
    • https://cdn.sqhk.co/fesoxuleri/hiiargN/73147440649.pdfIn PDF document text
    • http://gidujepeparu.22web.org/australian_child_passport_renewal_form.pdfIn PDF document text
    • http://trelon.fun/49239877138cbp25.pdfIn PDF document text
    • http://instapriz.website/tietz_fundamentals_of_clinical_chemistry_and_molecular_diagnostics_7e_free_downloadnw0hv.pdfIn PDF document text
    • http://zopesudi.iblogger.org/numerologia_tantrica_kundalini.pdfIn PDF document text
    • https://cdn.sqhk.co/dedikunakudu/yPUieih/tidutubuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://504b7f7c-d27d-4f2b-a6eb-e8dc7cf660cf.filesusr.com/ugd/6ba015_ac721d7a657945e89752957b8ee78799.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc5501d8-6af8-4a21-9ebb-a0b9e491dced/73968664872.pdfIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_753d6e1270d54003933a15b82d7738e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d39752-451a-48fc-af74-be89332918f0/berapi.pdfIn PDF document text
    • http://bavidoripo.epizy.com/english_for_aviation_oxford.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47153a24-dbd2-4130-8f26-a36c2d903649/the_spiritual_man_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c966795-900e-4463-935a-0a508aefe938/how_much_does_a_criminal_lawyer_make_in_chicago.pdfIn PDF document text
    • http://bapaxofobawob.rf.gd/48862638596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90711edf-2fad-4efa-8ee0-19ffe882a23d/crossbow_plans_pattern.pdfIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_5eeff24fe9d34842afddebc925328c14.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6c886d7-c9c4-4ffe-87f6-b8a6bba8d062/how_to_help_your_child_succeed_in_primary_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8122925d-bcb7-43ab-8906-0d74b25c2843/the_500_greatest_songs_of_all_time_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f68855c1-c6d8-4eff-8775-13b1b163a581/78761407162.pdfIn PDF document text
    • http://zodamexuzawafi.epizy.com/autodwg_to_dwg_converter_chomikuj.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001014b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 5336 bytes
SHA-256: 6e1542a649d7f4075cb0937d85df17e723a899184d5e72a4373c47a7f7a04cd8
font_01_sfnt_off00011357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11357 11896 bytes
SHA-256: fd48799bab2d0f4196260892c090a2ce66d6ca719ea1c42fd727247b2bd7d311

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