Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b3ef757b49ffcc…

MALICIOUS

PDF

128.3 KB Created: 2021-03-18 04:28:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5cf69121e34c36be8b155360771829a7 SHA-1: c89b7261fa17526fddd63aa239685fa19534dc72 SHA-256: 89b3ef757b49ffccde939925f521143fa5f8788cbea5431092f39073c8eccd64
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. The embedded URLs and the nature of the link farm point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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/123?utm_term=as+400+software+free PDF link annotation
    • https://manomukujoputu.weebly.com/uploads/1/3/4/5/134517900/2ea42f.pdfIn PDF document text
    • http://resufomuvojos.22web.org/2553779184.pdfIn PDF document text
    • https://regogugone.weebly.com/uploads/1/3/4/8/134891767/tajil_nulamuta.pdfIn PDF document text
    • https://sarununow.weebly.com/uploads/1/3/4/3/134366188/kikixebixok-wabuzojozeno-zuzaji.pdfIn PDF document text
    • https://botakukejase.weebly.com/uploads/1/3/4/6/134610266/vesojazokiri.pdfIn PDF document text
    • https://tukevepa.weebly.com/uploads/1/3/0/8/130814993/xiwotoxeguru-posawimesotixu.pdfIn PDF document text
    • http://busotokebos.iblogger.org/zokokovidusepavej.pdfIn PDF document text
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/tujebipuzofo.pdfIn PDF document text
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/duwevapekimuw.pdfIn PDF document text
    • http://fekedusotuxena.iblogger.org/icelandic_volcano_news_report.pdfIn PDF document text
    • https://lafetewefovizav.weebly.com/uploads/1/3/4/3/134385578/digigosujibizatima.pdfIn PDF document text
    • https://roxuvipiga.weebly.com/uploads/1/3/4/6/134637137/c2f76f35a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://busezax.rf.gd/intracerebral_haemorrhage_management_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9514f98-86c4-477d-81ad-8a1dd8fa1f9e/67516431893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1ac9384-8328-42ca-b797-122f5697df9f/64764592258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95d13cf0-7953-4534-8fed-e537744f12e5/blood_gas_analysis_normal_range.pdfIn PDF document text
    • http://volafipodu.rf.gd/63365722738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eb773fa-71f3-46c0-b8bf-50ef2d615bb5/95814629902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7012f028-ed26-4e69-afc8-4cdce67aedbc/pudanixadarakarebugafapij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0744a8d1-f711-40bd-8397-d4e62db42828/why_does_my_panasonic_tv_turn_on_by_itself.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f616ae-368e-4ed7-b3b2-33426c75c7a7/windows_all_os_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8f872f-56c6-4a92-a201-69a2ed7c6777/butefapofudifepixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8a6420d-089e-4e5d-906a-87ecc9f41f5f/how_to_reset_logitech_receiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d16e684f-9b90-4842-84c4-8026c5846ee7/fedifobotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e5f5c42-bae1-4700-9360-daa1cb1dbfa9/shimano_nexus_8_speed_wheel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8C9 4672 bytes
SHA-256: 36de9463a404f674f9b2c5ae76014ad7efa706e5b391485db50d1bb786e6f0bc
font_01_sfnt_off0001b8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8C0 13000 bytes
SHA-256: 795dc496c526172126074b8f0499ff1a5164d1923514ca10490b19576d3c09b7
font_02_sfnt_off0001e3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3D0 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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