Malicious PDF — malware analysis report

Static analysis result for SHA-256 91612de9cd855b91…

MALICIOUS

PDF

90.0 KB Created: 2021-03-15 22:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c3ee64aaf83f056a43769b8085a7234e SHA-1: 2f62a5c8b8c1f560f52f5246a0567cba59bc7eb5 SHA-256: 91612de9cd855b913378901ceab94799f65f35d0f925ff93a25c64733792abaf
126 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with one specifically pointing to 'bologen.ru', suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying the sample as a link farm on disposable hosting, designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://bologen.ru/123?utm_term=hasbro+ultimate+bumblebee+transformer+instructions PDF link annotation
    • https://cdn.sqhk.co/tamupoto/hrdidJy/57540544273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370059/normal_60149214d6109.pdfIn PDF document text
    • http://dajobod.getenjoyment.net/econometrics_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/xedaberetaj/Aidjjhh/51581496625.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385204/normal_604a13c4a4e6d.pdfIn PDF document text
    • https://cdn.sqhk.co/sivefuxonix/hfEFohh/tizesikap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401555/normal_5fda8d715b771.pdfIn PDF document text
    • http://baxijemapuzoxu.22web.org/75576658383.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/tipos_de_angulos_geometria.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459062/normal_600e2206b3f15.pdfIn PDF document text
    • http://joruzutababu.22web.org/how_much_money_do_natives_get_when_they_turn_18_in_canada.pdfIn PDF document text
    • http://tixaman.scienceontheweb.net/talorovudovisewogunupo.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/gimidokejixizaruwitewaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_f01965d814c1481f8fab8b97edd26937.pdf?index=trueIn PDF document text
    • http://xamivopawotiw.epizy.com/class_11th_chemistry_practical_book.pdfIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_ddb1a4d6abe44a539308225f1d62edcb.pdf?index=trueIn PDF document text
    • http://bebefavovujeji.rf.gd/introduction_to_management_science_15th_edition.pdfIn PDF document text
    • http://bewaxupu.rf.gd/throne_of_glass_goodreads.pdfIn PDF document text
    • http://mevalegija.rf.gd/2410288832.pdfIn PDF document text
    • http://lefumes.rf.gd/billboard_music_awards_2020_performers.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/what_is_the_best_alexa_for_music.pdfIn PDF document text
    • http://jenepopavuse.epizy.com/sda_church_heritage_questions_and_answers.pdfIn PDF document text
    • http://tawexega.epizy.com/professional_blog_post_format.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_55dc3ddc07b149a7bd0e1bc48fe5421a.pdf?index=trueIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_11b0304475ee46a1841348cc867fac9d.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_off00012226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 5128 bytes
SHA-256: b3586124d8fdbce4f1e3c46943cfc75d3e37a822feface8ab1cfd6ac78449fb3
font_01_sfnt_off0001337f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337F 11400 bytes
SHA-256: 15955ede50840b67f0a7e895adaebac01aeca5e2bdb35736b8688c663eeb7319