Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f16d51448afa76…

MALICIOUS

PDF

80.4 KB Created: 2021-04-19 18:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5035f4d41a778173303a47bbfa504add SHA-1: 5996e91ee5394cd3ef33314b54f949cb665a76ca SHA-256: 25f16d51448afa76c68004578fe4603495e1e546f4a0f62fab6fc73cf7dcd307
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://golowaki.ru/strik?utm_term=how+to+use+rapid+diagnostic+test+for+malaria PDF link annotation
    • https://boziwigezuzes.weebly.com/uploads/1/3/5/9/135984517/xawoves.pdfIn PDF document text
    • http://towonededuv.medianewsonline.com/famusuw.pdfIn PDF document text
    • http://rawiduti.medianewsonline.com/41940530710.pdfIn PDF document text
    • http://all-system7.club/experience_cv_templatek80nd.pdfIn PDF document text
    • http://abistrans.ru/55857907577m1h93.pdfIn PDF document text
    • http://my-favshoph.online/miwiduminuwutagiba692bm.pdfIn PDF document text
    • http://ipoteka.net/504243732789g25e.pdfIn PDF document text
    • https://komomofuxuz.weebly.com/uploads/1/3/4/4/134494735/6112331.pdfIn PDF document text
    • https://soravetojovon.weebly.com/uploads/1/3/4/8/134890923/sofijib.pdfIn PDF document text
    • https://lodarexuxune.weebly.com/uploads/1/3/4/3/134352809/bazokuson-rotuvamugo.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/peavey_vypyr_vip_1_20w_1x8_guitar_modeling_combo_amp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://maretubozewugi.myartsonline.com/red_dapple_weiner_dogs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b691cd20-6d68-4965-a236-1132ae3b9ad4/we_have_been_dating_for_6_weeks_worried_and_tired.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78712062-f3e7-449e-8aed-d2b2102a9aa2/are_nys_drivers_license_renewals_extended.pdfIn PDF document text
    • http://zeteximezoxa.myartsonline.com/dovizifak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2fecc40-f772-4cb2-9560-0cf5f9a2d538/3190360251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ba9848-70b4-4d3e-8bbe-4be94897368a/ropib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76a3f49-a221-445a-9bac-b9d765551b3c/12872067296.pdfIn PDF document text
    • http://zozupajekuledus.myartsonline.com/37035064938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9e08c5d-1481-409c-8415-561ca047202b/69829748094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa9a62b-7800-42f8-a392-2367a03ceac7/2009_toyota_corolla_battery_drain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06292e68-d6f1-4e57-929d-6823c626346c/34904422485.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/wofakakisuvaravorobivazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3452fb44-0cdf-472b-b489-a46f53ab3889/38084345884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bcf2950-cd26-4610-a86b-48992a93e6cc/what_is_the_oldest_continuous_civilization_in_the_world.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_off0000fcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAE 5528 bytes
SHA-256: 17b29ee4e880df9ca9ef4137771e25b1a7b3f32358cb6e4373b83bbe6c7dfc3b
font_01_sfnt_off00010f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7A 10668 bytes
SHA-256: 0ab2ea11771aee8c33ec7a28acd14d519d9e6c8de081919c0b48daf33254bb5d