Malicious PDF — malware analysis report

Static analysis result for SHA-256 500969a25a9ea996…

MALICIOUS

PDF

76.5 KB Created: 2021-03-15 22:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 82332552a5097d765ea7bb2985f2945e SHA-1: 48e8c46cc56941103e2ca1f43d3901d622ab4dd5 SHA-256: 500969a25a9ea996eca8591bf9bb7eca283b441ad892c9c640eb58ce66f17dd4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, a common tactic for SEO spam or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites, such as the one found at https://baarspo.ru/strik. The presence of numerous links on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://baarspo.ru/strik?utm_term=what+is+humanism+theory PDF link annotation
    • https://cdn.sqhk.co/xenojepezere/Kbgh9jf/trafic_tours_cancun_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/idhhnjd/gostream_app_download.pdfIn PDF document text
    • http://zukirudon.mypressonline.com/burdah_imam_busiri.pdfIn PDF document text
    • http://gvidilon.ru/intermec_easycoder_pm4i_label_not_found1075g.pdfIn PDF document text
    • http://storezone.info/10th_class_math_solution_arts_groupizt0y.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/jHhbLhg/nekar.pdfIn PDF document text
    • http://tanolugulutewu.medianewsonline.com/university_admission_letter_sample.pdfIn PDF document text
    • https://cdn.sqhk.co/zetuzire/giidgif/62013301972.pdfIn PDF document text
    • http://1cats.space/loremipejuxokas3o0hp.pdfIn PDF document text
    • http://nout-prokat.website/sociologie_politique_philippe_braudlxaj9.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/32484105016.pdfIn PDF document text
    • http://mavitrade.com/tl_wr841n_change_admin_password09kab.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/dhfCibS/wolf_wallpaper_for_iphone_4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_6b65e58473c84f85a959651445e89b87.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a180adbe-9258-4574-b0bd-dfdf551c8073/66292263788.pdfIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_911e0de51826492a9ceca4ae2d4f6674.pdf?index=trueIn PDF document text
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_0ab7309a999c4f0ea27e1bd21f5553d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e49ad1a8-d25f-444c-b90c-e09d0320e34e/simple_and_compound_probability_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fd9437c-e84a-400d-9e65-735a0593a2dd/black_max_6560_generator_carburetor.pdfIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_a10fab1af7ad401ab550c168acf4c639.pdf?index=trueIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_546d76e99adc4843aa2f793923b64dd3.pdf?index=trueIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_dd46857acdab4cd1802b900a03c3fdf3.pdf?index=trueIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_250749ab46764a9bacf7d62386ebb031.pdf?index=trueIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_135264e2dc6544c6af7ce2210894af9c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0c310b4-b3ed-438d-9d34-edf6fe21e10d/bob_evans_menu_farmers_breakfast.pdfIn PDF document text
    • https://71bfc0c6-4bef-405a-aee6-9e9dcaab3d12.filesusr.com/ugd/708cfd_f5c384f1e9754421be9a09fddcebf0a9.pdf?index=trueIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_0f261f048d0c431ea861a86fc00fdc86.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28de68ac-06a0-4eb5-a1ce-758706485aff/jabaziridizudosukuwenamo.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_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 5008 bytes
SHA-256: 98e761467f62968a2efcdb98849d4b60769d7f81671a199921f238b7d1f0b602
font_01_sfnt_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 10224 bytes
SHA-256: 2bab35db77e110bed8bb35437d23c300290841a95e473b489289312431aa3aa1

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