Malicious PDF — malware analysis report

Static analysis result for SHA-256 6444d74c7a86e30f…

MALICIOUS

PDF

79.6 KB Created: 2021-03-13 22:58:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9f97aae4d0b11cd1f81bd65ad506de54 SHA-1: 887b3c4e3862badfcd92b94151142886a7e58f68 SHA-256: 6444d74c7a86e30f3b13782ae471f77f2108c8cb2b40b993c14d0a76cc623c90
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and configured as link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=how+to+dye+hair+evenly PDF link annotation
    • http://demejizato.22web.org/84137529551.pdfIn PDF document text
    • https://jufikaparilo.weebly.com/uploads/1/3/4/5/134592165/voresavupa-kojokirolubikes.pdfIn PDF document text
    • http://nutristrike-shop.ru/36668003769co6kf.pdfIn PDF document text
    • http://gotuxeloso.22web.org/lyman_shotshell_reloading_handbook_4th_edition.pdfIn PDF document text
    • http://naturaleone.space/xixozikaboriganadg7h4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458618/normal_5fe9c4d758586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_604380c226a32.pdfIn PDF document text
    • http://nat-fru.space/staphylococcus_aureus_diseases87zcl.pdfIn PDF document text
    • https://tovibimatajo.weebly.com/uploads/1/3/5/9/135963052/kufulexobodeme.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496818/normal_6007285d2d0f4.pdfIn PDF document text
    • http://mavimudig.22web.org/how_to_fail_at_almost_everything_and_still_win_big_epub_download.pdfIn PDF document text
    • http://disconto50.info/ranixitogosonuligolotqim2v.pdfIn PDF document text
    • http://yandex-delivery.cc/lubira23hme.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zomixep.rf.gd/grigori_grabovoi_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbee4e4e-efc4-41a9-bf54-31b6e60052b6/65729227845.pdfIn PDF document text
    • http://tajuxubixasisew.epizy.com/el_libro_zend_avesta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9934eb5f-179b-44bb-88db-a943dcf5e6d1/zovojemefedesuti.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/solerevuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cb30751-5417-4101-bdc9-7408d90f34a2/82658962459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519f91f4-2c76-4827-8427-851647ed5de0/zamuraxodojifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d629a694-9a8f-4547-a5d2-355064bd42cd/sudaf.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/ms_project_2013_free_download_with_crack_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/kipepupamuvamiwem.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/distance_measurement_using_ultrasonic_sensor_project_report.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_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 4952 bytes
SHA-256: ff9944b9dd34af9ede3a0aa5252c4f231529665211e038b7cbec89b297370b7f
font_01_sfnt_off00010ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD8 11332 bytes
SHA-256: d596f6423bba7d51d4c0db2d5791160fba78e3924a3679eea0b7cd7d6eaf88ae

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