Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7927c587f61c55…

MALICIOUS

PDF

80.9 KB Created: 2021-03-16 08:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c4955b66c7461878180b83bae201b64a SHA-1: 8a9d98a73bd37744af7fff7c819466daa783b8f4 SHA-256: 8d7927c587f61c5578b1f7c7e7e4cab872f3740b62d5e2e83fb9fdddc61e20ef
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://soxebez.ru/strik?utm_term=will+a+tile+saw+cut+stone PDF link annotation
    • http://nexofozupugasi.mywebcommunity.org/jakusukenobodusoruluk.pdfIn PDF document text
    • http://otomail.business/banibaxavztczb.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/jokakaf3ywbw.pdfIn PDF document text
    • http://vadosaj.getenjoyment.net/using_vitamix_to_lose_weight.pdfIn PDF document text
    • http://potuduwatolebu.mywebcommunity.org/77394508009.pdfIn PDF document text
    • http://fufejezonodim.mywebcommunity.org/sagujek.pdfIn PDF document text
    • http://circus.market/sopobigepugor63lw.pdfIn PDF document text
    • http://eurofamily.pro/rukapunuraxinonul9d6tj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_d87df2c6241d47b9a8a168a8c551ee95.pdf?index=trueIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_95e07eb3b9974fa684fd74e2c19d848a.pdf?index=trueIn PDF document text
    • http://sojufuka.atwebpages.com/2007_f350_6.0_powerstroke_for_sale.pdfIn PDF document text
    • http://rorazizaxaf.atwebpages.com/international_financial_management_8th_edition_by_cheol_eun_and_bruce_resnick.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ce78bbf-b58f-4e0b-a9fa-f16ad786294c/nespresso_lattissima_touch_descaling_light_flashing.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_6822c8609f1e4ad7864098719c1d478b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04633918-ae53-415a-9776-131e7bf29357/poxezukasezutuwara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1852021e-143e-4d5b-acb6-e6c2fbe24eda/star_trek_the_next_generation_books_reading_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/459f23eb-53c0-47e7-a027-9e100a1382f4/n2_is_it_polar_or_nonpolar.pdfIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_813dbb4df7c9416f8bad694b4b1acedb.pdf?index=trueIn PDF document text
    • http://lufopudizomuv.atwebpages.com/tinoweme.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/gidijedajeb.pdfIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_e4a0e7e49a684aaaa95c4ba074a783cf.pdf?index=trueIn PDF document text
    • http://kubomefewofumim.atwebpages.com/amharic_bible_names_for_boy.pdfIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_f8f5b92197164bac82f1bfa6146cec7f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c453ff35-ac0d-4f4c-8f94-6f5a8f5520ec/nordictrack_assembly_cost.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_50bb4650309641a295bff2e8299ba0f5.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_31f59c5e7b5744a6bd513bd8c4cccd7d.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_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 4800 bytes
SHA-256: b1616a6cb571812f538c6cb84658f9e398cb376ebd760a5eac60d2f5530442cc
font_01_sfnt_off00011007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11007 11296 bytes
SHA-256: fd1dc6560aa335432dc2341ab51b173e0ff44e8cf57c4f0d8cf2558ee25386d1